using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter your age");

        int x = Convert.ToInt32(Console.ReadLine());

        int x1 = 18-x;

        Console.WriteLine("Enter your weight");

        int y = Convert.ToInt32(Console.ReadLine());

        if (x >= 18)

        {

            if (y >= 50)

            {

                Console.WriteLine("All requirements match you can donate blood");

            }

            else

            {

                Console.WriteLine("You have to be 50kg or above to donate");

            }

        } else {

            Console.WriteLine("You have to be 18 years or above to donate.Just " +x1+ " years to go");

        }

    }

}