using System;

public class Program

{

    public static void Main()

    {

        int i = 1;

        int sum = 0;

        int num;

        while (i<=10)

        {

            Console.WriteLine("enter number {0}", i);

            num = int.Parse(Console.ReadLine());

            sum+=num;

            i++;

        }

        if (sum%10 != 0)

            Console.WriteLine(0.1*sum);

        else

            Console.WriteLine(sum/10);

    }

}