using System;

public class Program

{

    public static void Main()

    {

        new Sum();

        new Sum(10,20);

        new Sum(10.50f,10.50f);

        new Sum("Hello","World");

    }

    class Sum{

        public Sum(): this(0,0)

        {

        }

        public Sum(int a,int b){

            Console.WriteLine("Sum on Int A={0} and Int B={1} is: {2}",a,b,a+b);

        }

        public Sum(float a,float b)

        {

            Console.WriteLine("Sum of Float A={0} and  Float B={1} is: {2}",a,b,a+b);

        }

        public Sum(String a,String b)

        {

            Console.WriteLine("Concate of String A={0} and String B={1} is: {2}",a,b,a+" "+b);

        }

    }

}