hdu 5158 水题

#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>

using namespace std;

int main ( )
{
    int n,m;
    while ( ~scanf ( "%d%d" , &n , &m ))
    {
        printf ( "%d\n" , (m-1)%n );
    }
}