using System;

​

public class Program

{

    public static void Main()

    {

        var a = "5";

        var b = "5,0";

        var c = "5.0";

        double n1;

        double n2;

        double n3;

        if (double.TryParse(a, out n1) && double.TryParse(b, out n2) && double.TryParse(c, out n3))

        {

            double sum = n1 * 4 + n2 * 5 + n3 * 5;

            Console.WriteLine(sum.ToString());

        }

        else

        {

            Console.WriteLine("Unesi sve!");

        }

    }

}