using System;

public class Program

{

    public static void Main()

    {

        string name;

        string id;

        int MathGrade;

        int EngGrade;

        int HebGrade;

        int LashonGrade;

        name=Console.ReadLine();

        id=Console.ReadLine();

        MathGrade=int.Parse(Console.ReadLine());

        EngGrade=int.Parse(Console.ReadLine());

        HebGrade=int.Parse(Console.ReadLine());

        LashonGrade=int.Parse(Console.ReadLine());

        double avg=(MathGrade+EngGrade+HebGrade+LashonGrade)/4;

        Console.WriteLine(avg);

    }

}

​