using static System.Math;
using System.Collections.Generic;
using System.Linq;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = long.Parse(line[0]);
        var m = long.Parse(line[1]);
        getAns(n, m);
    }
    static void getAns(long n, long m)
    {
        var t = n * (n + 1) / 2L;
        Console.WriteLine(m >= t ? "Yes" : "No");
    }
}