diff --git a/interface.py b/interface.py
index 4a94b7e..2683e6f 100644
--- a/interface.py
+++ b/interface.py
@@ -39,10 +39,14 @@ wartosc_regresji.grid(column=1, row=4, sticky='w')
 
 
 def val_numbers():
+    max_metraz = 100000
+    max_piętro = 100
     metraz = metraz_entry.get()
     pietro = pietro_entry.get()
     if metraz == "" or not metraz.isdigit() or pietro=="" or not pietro.isdigit():
         messagebox.showinfo(title="Error", message=f"Please provide valid data")
+    elif int(metraz) < 0 or int(metraz) > max_metraz or int(pietro) < 0 or int(pietro) > max_piętro:
+        messagebox.showinfo(title="Error", message=f"Please provide numbers between 0 to 100 for floors and 0 to 100.000 for metric area.")
     else:
         confirm = messagebox.askyesno(title="Confirm", message="Do you want to start prediction?")