#include<stack>
#include<cstdio>
#include<stdio.h>
#include<iostream>
#include<math.h>
#include<set>
#include<sstream>
#include<cctype>
#include<string>
#include<cstring>
#include<map>
//#include<map>
#include<algorithm>
#include<cstdlib>
#include<queue>
#include <stdio.h>
#include <string.h>
#include <iomanip>
using namespace std;
#define ll long long 
#define MIN(a,b) (a)>(b)?(b):(a)
#define pf printf
#define sf scanf
#define eps 1e-9
#define PI acos(-1.0)
#define CLR(a, b) memset(a, b, sizeof(a))
#define LL long long
#define CPY(a, b) memcpy(a, b, sizeof(b))
#define ll long long
ll gcd(ll a, ll b){
    return b == 0 ? a : gcd(b, a%b);
}
ll lcm(ll a, ll b){
    return a*b / gcd(a, b);
}
int max(int a, int b){
    return a > b ? a : b;
}

int main(){
    int n, m;
    while (cin >> n >> m){
        while (m > n)m -= n;
        cout << m - 1 << endl;
    }
}