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

class Program
{
    static void Main()
    {
        var n = long.Parse(ReadLine());
        var a = (long)Math.Sqrt(2 * n);
        WriteLine(a * (a + 1) / 2 == n? $@"YES
{a}" : "NO");
    }
}