using System;

public class Program

{

    public static void Main(string[]args) 

    {

        int sno, m1 ,m2 ,m3 ,m4 ,m5,total;

        string sname;

        float avg,per;

        Console.WriteLine("mark list");

        Console.WriteLine("student roll no");

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

        Console.WriteLine("student.name");

        sname=Console.ReadLine();

        Console.WriteLine("marks");

        m1=int.Parse(Console.ReadLine());

            m2 =int.Parse(Console.ReadLine());

        m3 =int.Parse(Console.ReadLine());

        m4 =int.Parse(Console.ReadLine());

        m5 =int.Parse(Console.ReadLine());

        total=m1+m2+m3+m4+m5;

        Console.WriteLine("total");

        Console.WriteLine(total);

        avg =total/5;

        Console.WriteLine("average");

        Console.WriteLine(avg);

        per =avg*100;

        Console.WriteLine(per);

        if(per >=85)

        {

            Console.WriteLine("grade : A+");

        }

        else if(per >=80 && per<85)

        {

            Console.WriteLine("grade :A");

        }

        else if(per >=75 && per<80)

        {

            Console.WriteLine("grade :B");

        }

        else if(per  >=70 && per<75)

        {

            Console.WriteLine("grade :C");

        }

        else

        {

            Console.WriteLine("grade :D");

        }

    }

}