#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
#include<iomanip>
using namespace std;
typedef long long int lont;
int main() {
	int N;
	cin >> N;
	vector<int>veca(N);
	const int A = 30;
	for (int ia = 0; ia < N; ia++) {
		cin >> veca.at(ia);
	}
	int sum = 0;
	for (int ib = 0; ib < N; ib++) {
		sum += veca.at(ib);
	}
	int ans = 0;
	for (int ic = 0; ic < N; ic++) {
		if (veca.at(ic) <= sum / 10) {
			ans += A;
		}
	}
	cout << ans << endl;
}