import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        int N = scan.nextInt();
        int ans = 0;
        int C;
        int sum = 0;
        HashMap<Integer, Integer> M = new HashMap<>();
        for (int i = 0; i < N; i++) {
            C = scan.nextInt();
            M.put(i, C);
            sum += C;
        }
        for (int i = 0; i < N; i++) if (M.get(i) * 10 <= sum) ans++;
        ans *= 30;
        System.out.println(ans);
    }
}