#include <bits/stdc++.h>
#include <vector>
#include <tuple>
#include <regex>
#include <string>
#include <stack>
#include <algorithm>
using namespace std;

int main(){
    long N,M;
    scanf("%ld %ld",&N,&M);
    if(N*(N+1)/2 <= M){
        printf("Yes");
    } else {
        printf("No");
    }
}