#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> C(N);
    ll sum = 0;
    for (int i=0; i<N; i++) { 
        cin >> C[i];
        sum += C[i];
    }
    int result = 0;
    for (auto x : C) {
        if (x*10 <= sum) { result++; }
    }
    cout << result * 30 << endl;
    return 0;
}