C :

#include<stdio.h>
#define mod(x,y) printf("%d\n",x%y)

int main()
{
	int x,y;
	scanf("%d%d",&x,&y);
	mod(x,y);
	return 0;
}

C++ :

#include <stdio.h>
#define mod(a, b) (a % b)
int main() {
	int a, b;
	scanf("%d%d", &a, &b);
	printf("%d\n", mod(a, b));
	return 0;
}

Pascal :

var
  a,b:longint;
begin
  readln(a,b);
  writeln(a mod b);
end. 

Java :

import java.util.Scanner;

public class Main{
   private static Scanner s = new Scanner(System.in) ;
   
   public static void main(String[] args) {
      int a = s.nextInt() ;
      int b = s.nextInt() ;
      
      System.out.println(a%b);
      
   }
}