#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;

    vector<int> c(n);
    int votes = 0;
    for (int i = 0; i < n; ++i) {
        cin >> c[i];
        votes += c[i];
    }

    int ans = 0;
    for (int i = 0; i < n; ++i) {
        if (10 * c[i] <= votes) ans += 30;
    }

    cout << ans << endl;
    return 0;
}