using System;
using System.Collections.Generic;
using static System.Console;
namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(ReadLine());
            //等差数列
            //k(k+1)/2 = n
            //√k(k+1) = √2n
            //√k*k < √k(k+1) = √2n < √(K+1)(k+1)
            //k<√2n<k+1
            //(long)√2n →　k
            long a = (long)Math.Sqrt(2 * N);
            if(a * (a + 1) / 2 == N)
            {
                WriteLine("YES");
                WriteLine(a);
            }
            else
            {
                WriteLine("NO");
            }
        }
    }
}