using System;

public class Program
{
	public static void Main()
	{
		Console.WriteLine(Sum(1, 2, 3, 4, 5));
		Console.WriteLine(SumWithoutParams(new int[] {1, 2, 3, 4, 5}));
	}

	public static int Sum(params int[] numbers)
	{
		var sum = 0;
		foreach (var n in numbers) { sum += n; }
		return sum;
	}

	public static int SumWithoutParams(int[] numbers)
	{
		var sum = 0;
		foreach (var n in numbers) { sum += n; }
		return sum;
	}
}