using System;
using System.Collections.Generic;

namespace test
{
    static class Program
    {
        static void Main()
        {
            string[] str = Console.ReadLine().Split(' ');
            long n = long.Parse(str[0]);
            long m = long.Parse(str[1]);
            if (m >= n * (n + 1) / 2)
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }
        }
    }
}