using System;

​

public class Program

{

    public static void Main()

    {

        int num;

        Console.WriteLine("Enter number");

        num + int.Parse(Console.ReadLine());

        if

    }

}

​

int firstNo;

Console.Write( "Enter a number" ) ; firstNo =  int .Parse(Console.ReadLine());

firstNo =  Convert.(Console.ReadLine() ) ; sum =  firstNo ; Console.WriteLine( "{0}" ) ; (firstNo) ;