View Code of Problem 3495

#include <algorithm>
#include <cstring>
#include <iostream>
#include <string>
using namespace std;

int mod(int a ,int b){
    int tmp = a / b;
    return a - b * tmp;
}

int main()
{
    int a, b;
    while(cin >> a >> b){
        cout << mod(a,b) << endl;
    }
}