#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    long long N,P; cin >> N >> P;
    if(N == 0){cout << "No\n"; return 0;}
    if(N+1 == P){cout << "Yes\n"; return 0;}
    if((P-1)%(N+1) == 0) cout << "Yes\n";
    else cout << "No\n";
}