using System;

public class Program

{

    public static void Main()

    {

        string temp;

        double num1, num2, num3, sum, avg;

        Console.WriteLine("Please enter first number:");

        temp = Console.ReadLine();

        num1 = double.Parse(temp);

        Console.WriteLine("Please enter second number:");

        temp = Console.ReadLine();

        num2 = double.Parse(temp);

        Console.WriteLine("Please enter third number:");

        temp = Console.ReadLine();

        num3 = double.Parse(temp);

        sum = num1 + num2 + num3;

        avg = sum / 3;

        Console.WriteLine("sum: " + sum);

        Console.WriteLine("avg: " + avg);

    }

}