import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int sum = 0;
		int[] c = new int[N];
		for (int i = 0; i < c.length; i++) {
			c[i] = sc.nextInt();
			sum += c[i];
		}
		int out = 0;
		for (int i = 0; i < c.length; i++) {
			if (c[i] * 10 <= sum) {
				out++;
			}
		}
		System.out.println(out * 30);

	}
}