import java.util.Scanner;

public class Main
{

    public static void main (String[] args)
    {
        Scanner in= new Scanner (System.in);
        int  num, sum=0, avg;
             for (int i= 0; i<=12 ; i++)
             {
               System.out.println("Please enter 12 grades");
               num=in.nextInt();
               sum= sum+num;
             }
             avg= sum/12;
             System.out.println("The average of the grades is: "+avg);
    }
}