using System;

public class Program

{

    public static void Main()

    {

        float questions,correct,wrong,total,none,nomremanfi,mark,percent;

        string input;

        Console.WriteLine("number of questions:");

        input=Console.ReadLine();

        questions=float.Parse(input);

        Console.WriteLine("number of currect answers:");

        input=Console.ReadLine();

        correct=float.Parse(input);

        Console.WriteLine("number of wrong answers");

        input=Console.ReadLine();

        wrong=float.Parse(input);

        Console.WriteLine("number of none");

        input=Console.ReadLine();

        none=float.Parse(input);

        total=correct+wrong+none;

        if (total!=questions)

            Console.WriteLine("Invalid inputs!");

        else

        {

            nomremanfi=wrong/3.0f;

            mark=correct-nomremanfi;

            percent=mark/questions*100;

            Console.WriteLine("your mark is "+mark);

            Console.WriteLine("your percent is "+percent);

        }

    }

}