They should all be members of the class, like this: ```cs using System; internal class Program {

using System;

internal class Program
{
    private static void Main(string[] args)
    {
        double total;
        total = Multiply(2, 3, 4);
        Console.WriteLine(total);
    }
    
    static double Multiply(double a, double b)
    {
        return a * b;
    }
    static double Multiply(double a, double b, double c)
    {
        return a * b * c;
    }
}

using System;

internal class Program
{
    private static void Main(string[] args)
    {
        double total;
        total = Multiply(2, 3, 4);
        Console.WriteLine(total);
    }
    
    static double Multiply(double a, double b)
    {
        return a * b;
    }
    static double Multiply(double a, double b, double c)
    {
        return a * b * c;
    }
}