diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..1ff0c42
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,63 @@
+###############################################################################
+# Set default behavior to automatically normalize line endings.
+###############################################################################
+* text=auto
+
+###############################################################################
+# Set default behavior for command prompt diff.
+#
+# This is need for earlier builds of msysgit that does not have it on by
+# default for csharp files.
+# Note: This is only used by command line
+###############################################################################
+#*.cs diff=csharp
+
+###############################################################################
+# Set the merge driver for project and solution files
+#
+# Merging from the command prompt will add diff markers to the files if there
+# are conflicts (Merging from VS is not affected by the settings below, in VS
+# the diff markers are never inserted). Diff markers may cause the following
+# file extensions to fail to load in VS. An alternative would be to treat
+# these files as binary and thus will always conflict and require user
+# intervention with every merge. To do so, just uncomment the entries below
+###############################################################################
+#*.sln merge=binary
+#*.csproj merge=binary
+#*.vbproj merge=binary
+#*.vcxproj merge=binary
+#*.vcproj merge=binary
+#*.dbproj merge=binary
+#*.fsproj merge=binary
+#*.lsproj merge=binary
+#*.wixproj merge=binary
+#*.modelproj merge=binary
+#*.sqlproj merge=binary
+#*.wwaproj merge=binary
+
+###############################################################################
+# behavior for image files
+#
+# image files are treated as binary by default.
+###############################################################################
+#*.jpg binary
+#*.png binary
+#*.gif binary
+
+###############################################################################
+# diff behavior for common document formats
+#
+# Convert binary document formats to text before diffing them. This feature
+# is only available from the command line. Turn it on by uncommenting the
+# entries below.
+###############################################################################
+#*.doc diff=astextplain
+#*.DOC diff=astextplain
+#*.docx diff=astextplain
+#*.DOCX diff=astextplain
+#*.dot diff=astextplain
+#*.DOT diff=astextplain
+#*.pdf diff=astextplain
+#*.PDF diff=astextplain
+#*.rtf diff=astextplain
+#*.RTF diff=astextplain
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3c4efe2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,261 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+#*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
\ No newline at end of file
diff --git a/README.md.txt b/README.md.txt
new file mode 100644
index 0000000..3c085f5
--- /dev/null
+++ b/README.md.txt
@@ -0,0 +1 @@
+Aplikacja konsolowa napisana w jezyku C#. Aby go odpalic potrzebne IDE lub z poziomu konsoli w systemie windows z zainstalowanym .NET Frameworkiem wykonac polecenie: dotnet msbuild - zwroci sciezke skompilowanego pliku exe, ktory mozna odpalic.
\ No newline at end of file
diff --git a/WlasnosciPierscieni.sln b/WlasnosciPierscieni.sln
new file mode 100644
index 0000000..783933a
--- /dev/null
+++ b/WlasnosciPierscieni.sln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WlasnosciPierscieni", "WlasnosciPierscieni\WlasnosciPierscieni.csproj", "{214DCD41-708A-4F4A-A796-1C3143E7873F}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {214DCD41-708A-4F4A-A796-1C3143E7873F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {214DCD41-708A-4F4A-A796-1C3143E7873F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {214DCD41-708A-4F4A-A796-1C3143E7873F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {214DCD41-708A-4F4A-A796-1C3143E7873F}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+EndGlobal
diff --git a/WlasnosciPierscieni/App.config b/WlasnosciPierscieni/App.config
new file mode 100644
index 0000000..731f6de
--- /dev/null
+++ b/WlasnosciPierscieni/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/WlasnosciPierscieni/Program.cs b/WlasnosciPierscieni/Program.cs
new file mode 100644
index 0000000..32fdb57
--- /dev/null
+++ b/WlasnosciPierscieni/Program.cs
@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WlasnosciPierscieni
+{
+ class Program
+ {
+ static void Main(string[] args)
+ {
+ int n;
+ if (args.Count() > 0)
+ {
+ if (!int.TryParse(args[0], out n))
+ {
+ Console.WriteLine("Invalid argument");
+ return;
+ }
+ }
+ else
+ {
+ Console.WriteLine("Podaj n");
+ if(!int.TryParse(Console.ReadLine(),out n))
+ {
+ Console.WriteLine("Invalid arguemnt");
+ return;
+ }
+ }
+
+ IEnumerable pierscien = Enumerable.Range(0, n).ToList();
+
+ Console.WriteLine("\nElementy odwracalne:");
+ foreach (int i in pierscien)
+ {
+ foreach (int j in pierscien)
+ {
+ if ((i * j) % n == 1)
+ {
+ Console.Write(i + " ");
+ break;
+ }
+ }
+ }
+
+ Console.WriteLine("\nDzielniki zera:");
+ foreach (int i in pierscien)
+ {
+ foreach (int j in pierscien)
+ {
+ if (j == 0)
+ {
+ if (i == 0)
+ {
+ Console.Write("0 ");
+ break;
+ }
+ continue;
+ }
+ if ((i * j) % n == 0)
+ {
+ Console.Write(i + " ");
+ break;
+ }
+ }
+ }
+
+ Console.WriteLine("\nElementy nilpotentne:");
+ List dzielniki = new List();
+ int current, pow;
+ foreach (int i in pierscien)
+ {
+ current = i;
+ pow = 2;
+ dzielniki.Clear();
+ while (!dzielniki.Contains(current))
+ {
+ dzielniki.Add(current);
+ current = (int)(Math.Pow(i,pow)) % n;
+ if (current == 0)
+ {
+ Console.Write(i + " ");
+ break;
+ }
+ pow++;
+ }
+ }
+
+ Console.WriteLine("\nElementy idempotentne:");
+ foreach (int i in pierscien)
+ {
+ if ((i * i) % n == i)
+ {
+ Console.Write(i + " ");
+ }
+ }
+
+ Console.WriteLine("\nEnd");
+ Console.ReadKey();
+
+
+ }
+ }
+}
diff --git a/WlasnosciPierscieni/Properties/AssemblyInfo.cs b/WlasnosciPierscieni/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..a33d161
--- /dev/null
+++ b/WlasnosciPierscieni/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("WlasnosciPierscieni")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("WlasnosciPierscieni")]
+[assembly: AssemblyCopyright("Copyright © 2018")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components. If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("214dcd41-708a-4f4a-a796-1c3143e7873f")]
+
+// Version information for an assembly consists of the following four values:
+//
+// Major Version
+// Minor Version
+// Build Number
+// Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/WlasnosciPierscieni/WlasnosciPierscieni.csproj b/WlasnosciPierscieni/WlasnosciPierscieni.csproj
new file mode 100644
index 0000000..34ee7f9
--- /dev/null
+++ b/WlasnosciPierscieni/WlasnosciPierscieni.csproj
@@ -0,0 +1,60 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {214DCD41-708A-4F4A-A796-1C3143E7873F}
+ Exe
+ Properties
+ WlasnosciPierscieni
+ WlasnosciPierscieni
+ v4.6.1
+ 512
+ true
+
+
+ AnyCPU
+ true
+ full
+ false
+ bin\Debug\
+ DEBUG;TRACE
+ prompt
+ 4
+
+
+ AnyCPU
+ pdbonly
+ true
+ bin\Release\
+ TRACE
+ prompt
+ 4
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file