#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> c(n);
    int sum = 0;
    for (int i = 0; i < n; i++) {
        cin >> c.at(i);
        sum += c.at(i);
    }
    int count = 0;
    for (int i = 0; i < n; i++) {
        if (sum >= c.at(i) * 10) {
            count++;
        }
    }
    cout << count * 30 << endl;
    return 0;
}