#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int64_t N, M;
    cin >> N >> M;
    if (M >= N * (N + 1) / 2)
        cout << "Yes\n";
    else
        cout << "No\n";
}