#include "bits/stdc++.h"
using namespace std;

int main() {
	int N, C[100], count = 0, P = 0;
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> C[i];
		count += C[i];
	}
	for (int i = 0; i < N; i++) {
		if (C[i] * 10 <= count) P++;
	}
	cout << P * 30 << endl;
}