import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        int loops = in.nextInt();
        int sum = 0;
        int[] arr = new int[101];
        
        for(int i=0; i<loops; i++){
            arr[i] += in.nextInt();
            sum += arr[i]; 
        }
        int money = sum / 10;
        int count = 0;
        for(int i=0; i<loops; i++){
            if(arr[i] <= money) count++;
        }
        System.out.println(count * 30);
    }
}