diff --git a/Jenkinsfile b/Jenkinsfile
index ad531e2..28cb0b9 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,5 +1,15 @@
 pipeline {
     agent any
+    
+    parameters {
+        string (
+            defaultValue: '100',
+            description: 'Wielkość odcięcia zbioru danych',
+            name: 'CUTOFF',
+            trim: false
+        )
+    }
+    
     stages {
         stage('Checkout') {
             steps {
@@ -11,7 +21,7 @@ pipeline {
         }
         stage('Download') {
             steps {
-                sh './create-dataset.sh'
+                sh "CUTOFF=${CUTOFF} ./create-dataset.sh"
             }
         }
         stage('Archive') {
diff --git a/create-dataset.sh b/create-dataset.sh
index 54fc2b3..9fca488 100755
--- a/create-dataset.sh
+++ b/create-dataset.sh
@@ -1,3 +1,5 @@
 #! /bin/bash
 
-wget https://git.wmi.amu.edu.pl/pms/uczenie-maszynowe/src/branch/main/wyk/iris.csv
\ No newline at end of file
+rm -f iris.csv && wget https://git.wmi.amu.edu.pl/pms/uczenie-maszynowe/src/branch/main/wyk/iris.csv
+head -n ${CUTOFF} iris.csv >data.csv
+wc -l *.csv
\ No newline at end of file