import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
       
       Scanner sc = new Scanner(System.in);
      
       
       
       
       System.out.println("Percentage calculator");
   
       System.out.println("enter 1st subject no.");
       int a = sc.nextInt();
   
          System.out.println("enter 2nd subject no.");
       int b= sc.nextInt();
   
       System.out.println("enter 3rd subject no.");
       int c = sc.nextInt();
   
   
       System.out.println("enter 4th subject no.");
       int d = sc.nextInt();
   
   
       System.out.println("enter 5th subject no.");
       int e = sc.nextInt();
   
        double total = (a+b+c+d+e)/5;
        double total2 = (a+b+c+d+e)/4;
        
        System.out.println("out of per subject 80 or 100");
        int outof = sc.nextInt();
        
        if (outof==100)
        
      
          System.out.println(total+"% in exam" );
      
       else if(outof==80)
        
         System.out.println(total2);
        
    }
}