using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the maths marks");

        int m = Int32.Parse(Console.ReadLine());

        Console.WriteLine("Enter the physics marks");

        int p = Int32.Parse(Console.ReadLine());

        Console.WriteLine("Enter the chem marks");

        int c = Int32.Parse(Console.ReadLine());

        Console.WriteLine("Enter your choice - Weighted Average (WA) or Normal Average(NA) ");

        string choice = Console.ReadLine();

        if (choice == "WA")

        {

            double Weighted = 0.5 * m + 0.25 * p + 0.25 * c;

            Console.WriteLine("Weighted average= " + Weighted);

        }

        else if (choice == "NA")

        {

            double normal = (m + p + c) / 3;

            Console.WriteLine("Normal average= " + normal);

        }

        else

        {

            Console.WriteLine("Wrong option for the choice! Try Again");

        }

    }

}