using System;

​

public class Program

{

    public static void Main()

    {

        double yearGrade, schoolGrade, finalGrade;

        Console.WriteLine("How much did Yonit got in the first semster ?");

        int sem1 = int.Parse(Console.ReadLine());

        Console.WriteLine("How much did Yonit got in the second semster ?");

        int sem2 = int.Parse(Console.ReadLine());

        Console.WriteLine("How much did Yonit got in the matconet ?");

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

        Console.WriteLine("How much did Yonit got in the bagrut ?");

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

        yearGrade = (sem1 + sem2) / 2;

        schoolGrade = (matconet + yearGrade) / 2.0;

        finalGrade = (schoolGrade + bagrut) / 2.0;

        Console.WriteLine("Yonit's yearly grade is : {0} ", yearGrade);

        Console.WriteLine("Yonit's school grade is : {0}", schoolGrade);

        Console.WriteLine("Yonit's final grade is : {0}", finalGrade);

    }

}