typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll n,m;
    std::cin >> n>>m;
    if(n*(n+1)/2<=m){
        std::cout << "Yes" << std::endl;
    }else{
        std::cout << "No" << std::endl;
    }
}