#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {

    int N;
    cin >> N;
    long S = 0;
    vector<long> cs;
    for (int i = 0; i < N; ++i) {
        long C;
        cin >> C;
        cs.push_back(C);
        S += C;
    }

    int res = 0;
    for (int i = 0; i < N; ++i) {
        if (cs[i] * 10 <= S) {
            res += 1;
        }
    }

    cout << res * 30 << endl;

    return 0;
}