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

int main() {
	int N;
	cin >> N;
	vector<int> v(N);
	int a = 0;
	for (int i = 0; i < N; i++) {
		cin >> v.at(i);
		a += v.at(i);
		//cout << v.at(i) << ',' << a << endl;
	}

	int sum = 0;
	for (int i = 0; i < N; i++) {
		double n = (double)v.at(i) / a;
		//cout << n << endl;
		if (!(n > 0.1)) sum += 30;
	}

	cout << sum << endl;
}