C :

#define Q(a,b) a%b  
main()  
{int c,d,t;  
scanf("%d%d",&c,&d);  
t=Q(c,d);  
printf("%d\n",t);  
}

C++ :

#include <iostream>
//#include <stdio.h>
//#include <conio.h>
#include <string>
//#include <math.h>
using namespace std;

int main()
{
	int a,b;
	cin >> a >> b;
	cout << a%b;
	//_getch();
	return 0;
}

Java :

import java.util.Scanner;

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

	}
}

Python :

a = map(lambda x:int(x), raw_input().split())

print a[0]%a[1]