#include <iostream>
#include <vector>

using namespace std;

int main() {

    std::ios::sync_with_stdio(false);
    std::cin.tie(0);

    int n;
    cin >> n;
    vector<int> vec;
    int allVote = 0;
    for (int i = 0; i < n; ++i) {
        int temp;
        cin >> temp;
        allVote += temp;
        vec.push_back(temp);
    }
    int count = 0;
    for (int j = 0; j < n; ++j) {
        if (vec.at(j) <= allVote / 10) count++;
    }
    cout << count * 30 << endl;
    return 0;
}