poj3980

简单题

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;

int main()
{
    //freopen("t.txt", "r", stdin);
    int a, b;
    while (scanf("%d%d", &a, &b)!= EOF)
        printf("%d\n", a % b);
    return 0;
}