View difference between Paste ID: 1TULBx9q and BqZTrW4M

 using System;
 
 class BitRoller
 {
     static void Main()
     {
-        int n =  int.Parse(Console.ReadLine());
+        int n = int.Parse(Console.ReadLine());
         int f = int.Parse(Console.ReadLine());
         int r = int.Parse(Console.ReadLine());
         int frozenBit = (n & (1 << f)) == 0 ? 0 : 1;
         for (int i = 0; i < r; i++)
         {
 
-            if ((n & 1) != 0)               //add bit @ pos 19 == to bit @ pos 0
+            if (((n & 1) != 0) && (f != 0))               //@ pos 19 adds 1 if value of bit @ pos is 1 and f !=0
             {
                 n = n | (1 << 19);
             }
             int leftBit = (n & (1 << (f + 1))) == 0 ? 0 : 1;    // the bit left from the frozenBit
             n = n & (~(1 << f)) | (leftBit << f);               // exchange left bit and frozen bit
             n = n & (~(1 << (f+1))) | (frozenBit << (f+1));
             n = n >> 1;                                         // removes right most bit
         }
 
         Console.WriteLine(n);
     }
 }