using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

namespace yukicoder
{
    public class Program
    {
        public static void Main()
        {
            var n = long.Parse(Console.ReadLine());
            var m = Math.Sqrt(n * 2 + 0.25)-0.5;
            if (m == Math.Floor(m))
            {
                Console.WriteLine("YES");
                Console.WriteLine(m);
            }
            else
            {
                Console.WriteLine("NO");
            }
        }
    }
}