#include "testlib.h"
#include <bits/stdc++.h>

using namespace std;

int main(int argc, char* argv[]){
  registerValidation(argc, argv);

  long long n=inf.readLong(1ll,1000000000ll);inf.readSpace();
  long long m=inf.readLong(1ll,1000000000ll);inf.readEoln();
  inf.readEof();
  long long minsig=((1+n)*n)/2;
  if(minsig <= m){cout << "Yes\n";}
  else{cout << "No\n";}
  return 0;
}