using System;

public  class Program

    {

        public static void Main(string[] args)

        {

            double result = CalculateExpression(5, 3, 2);

​

            Console.WriteLine("The result is " + result);

        }

​

        static double CalculateExpression(double a = 1, double b = 1, double c = 1) {

            double numerator  = a * Math.Abs(a-b) + 2 * a * b;

            double divider =  Math.Abs(a+b) * c;

            return numerator / divider;

        }

    }