using System;

public class Program

{

        public static int sum(int num1, int num2, int num3)

        {

            int total;

            total = num1 + num2 + num3;

            return total;

        }

        public static void Main(string[] args)

        {

            Console.Write("\n\nFunction to calculate the sum of two numbers :\n");

            Console.Write("--------------------------------------------------\n");

            Console.Write("Enter a number1: ");

            int n1 = Convert.ToInt32(Console.ReadLine());

            Console.Write("Enter a number2: ");

            int n2 = Convert.ToInt32(Console.ReadLine());

            Console.Write("Enter a number3: ");

            int n3 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("\nThe sum of three numbers is : {0} \n", sum(n1, n2, n3));

        }

}