using System;

public class Program

{

    public static void Main()

    {

        double tq1, tq2, tq3 , exam, ptquim, pexam, nquim;

        Console.WriteLine("Ingrese nota tarea 1: ");

        tq1 = Double.Parse(Console.ReadLine());

        Console.WriteLine("Ingrese nota tarea 2: ");

        tq2 = Double.Parse(Console.ReadLine());

        Console.WriteLine("Ingrese nota tarea 3: ");

        tq3 = Double.Parse(Console.ReadLine());

        Console.WriteLine("Ingrese nota de examen: ");

        exam = Double.Parse(Console.ReadLine());

        ptquim = ((tq1 + tq2 + tq3)/3)*0.15;

        pexam = exam * 0.8+5;

        nquim = ptquim+pexam;

        Console.WriteLine("Promedio quimica: {0}", nquim);

    }

}