using System;

public class Yuki648
{
	public static void Main()
	{
		var n = long.Parse(Console.ReadLine());
		var a = (long)Math.Sqrt(2 * n);
		if(a * (a + 1) / 2 == n) Console.WriteLine("YES" + "\r\n" + a);
		else Console.WriteLine("NO");
	}
}