import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int n = sc.nextInt();
		int[] ar = new int[n];
		int standard = 0;
		for (int i=0; i<n; i++) {
			ar[i] = sc.nextInt();
			standard += ar[i];
		}
		standard /= 10;
		
		int money = 0;
		for (int i=0; i<n; i++) {
			if (ar[i]<=standard) {money++;}
		}
		System.out.println(money*30);
	}
}