#include <iostream>
#include <numeric>
#include <vector>

constexpr int C = 30;

void solve() {
    int n;
    std::cin >> n;

    std::vector<int> xs(n);
    for (auto& x : xs) std::cin >> x;
    int s = std::accumulate(xs.begin(), xs.end(), 0);

    int ans = 0;
    for (auto x : xs) {
        if (x * 10 <= s) ++ans;
    }
    std::cout << ans * C << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}