#include <bits/stdc++.h>
#include<atcoder/all>
#define int long long
#define double long double
using namespace std;
int size(int number){
    string numstr=to_string(number);
    return numstr.size();
}
signed main(void){
    int N,M;
    cin>>N>>M;
    if(N==1){
        cout<<"Yes"<<endl;
        return 0;
    }
    if((M-(N-1)*N/2)>N-1){
        cout<<"Yes"<<endl;
    }else{
        cout<<"No"<<endl;
    }
}