static void Main(string[] arr)

        {

            Console.WriteLine(M(,));

            Console.ReadKey();

        }

        public static int  M(int n1, int n2)

        {

            n1=n1+n2;

            return n1;

        }

        public static string M(string s1, string s2)

        {

            s1 = s1 + s2;

            return s1;

        }

        public static int M(int n1, int n2,int n3)

        {

            n1 = n1 + n2+n3;

            return n1;

        }