import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int []C = new int[N];
		for(int i = 0; i < N; i++) {
			C[i] = scan.nextInt();
		}
		scan.close();
		int sum = 0;
		for(int i = 0; i < N; i++) {
			sum += C[i];
		}

		double k = sum / 10;
		int cnt = 0;
		for(int i = 0; i < N; i++) {
			if(k >= C[i]) {
				cnt ++;
			}
		}
		System.out.println(cnt * 30);

	}
}