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

int main() {
    int N;
    cin >> N;
    vector<int> C(N);
    for (int i = 0; i < N; i++) {
        cin >> C[i];
    }

    int book = 0;
    for (int i = 0; i < N; i++) {
        book += C[i];
    }

    int paper = 0;
    for (int i = 0; i < N; i++) {
        paper += (book >= C[i] * 10);
    }

    cout << 30 * paper << endl;
}