using System;

public class Program

{

    public static void Main()

    {

        int N = Convert.ToInt32(Console.ReadLine());

        int max, min, x;

        max = min = Convert.ToInt32(Console.ReadLine());

        for (int i = 1; i < N; i++)

        {

            x = Convert.ToInt32(Console.ReadLine());

            max = Math.Max(max, x);

            min = Math.Min(min, x);

        }

        Console.Write(min < 30 ? max + " YES" : max + " NO");

    }

}