how to subtract more than 2 numbers in c# : i am trying to make simple calculation and taking input of my own choice to subtract using loop but result is not coming true..

                            Console.WriteLine("Enter how many numbers u want to perform operations?");
                            int b = int.Parse(Console.ReadLine());
                            for (int i = 1; i <= b; i++)
                            {
                                Console.WriteLine("Enter " + i + " Number");
                                c = int.Parse(Console.ReadLine());

                               int s=s-c;


                            }
                          
                            Console.WriteLine("Result is={0}", s);