[Help] Simple question c#

Console.Write("Press any key to exit...");
Console.Read();

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace test
{
    class Program
    {
        static double CalcTotal(double num1, double num2)
        {
            double subtotal = num1 + num2;
            return subtotal;
        }
        static void Main(string[] args)
        {
            double subtotal = CalcTotal(9.3,4.3);
            Console.WriteLine("total:", subtotal);
            Console.Write("Press any key to exit...");
            Console.Read();
        }
    }
}