using System;

public class Program

{

    public static void Main()

    {

        int[,] myarray = {{2,5},{7,9},{12,7}};

        Console.WriteLine(myarray.GetLength(1));

        int[] ages = {15,16,12,19,30};

        int total = 0;

        foreach (int age in ages)

        { 

            total = total + age; 

        }

        int total1 = ages.Length;

        int mean = (total/total1);

        Console.WriteLine(mean);

    }

}