import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String type = sc.nextLine();
        
        if(!(type.equals("Undergraduate"))&&!(type.equals("Postgraduate"))){
            System.out.println("Invalid input");
            return;
        }
        
        String name = sc.nextLine();
        int id = sc.nextInt();
        int nog = sc.nextInt();
        int sum =0;
        
        for(int i=1; i<=nog; i++){
            if(hasNextInt()){
            int grade = sc.nextInt();
            sum+= grade;
        }
        }
        
        
        float avg =(float)sum/nog;
        
        
          System.out.printf("%.2f\n", avg);
    }
}