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

#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    int n, x;
    cin >> n >> x;
    cout << (n == 1 ? (x == 0 ? "Yes" : "No") : "Yes") << "\n";
}