using System;

public class Program

{

    public static void Main()

    {

        float a=Subtraction(10,5);

        Console.WriteLine(a);

        float b=Multiplication(10,5);

        Console.WriteLine(b);

        float c=Division(10,5);

        Console.WriteLine(c);

        Console.ReadLine();

    }

        public static float Subtraction(params float[]List)

        {

            float difference=0;

            foreach (var d in List)

            {

                difference=difference - d;

            }   

            return difference;

        }

            public static float Multiplication(params float[]List)

        {

            float product=1;

            foreach (var p in List)

            {

                product=product * p;

            }   

            return product;

        }

        public static float Division(params float[]List)

        {

            float quotient=1;

            foreach (var q in List)

            {

                quotient=quotient / q;

            }   

            return quotient;

        }

}