#include <stdio.h>
#include <algorithm>
#include <deque>
using namespace std;
using ll = long long;

//191
int main() {
	int n, c[100], totalc = 0, res = 0;
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%d", c + i);
		totalc += c[i];
	}
	for (int i = 0; i < n; i++)
		if (c[i] * 10 <= totalc)
			res++;
	printf("%d\n", 30 * res);
}