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

using namespace std;

int main() {
    int n;
    vector<int> v;
    
    cin >> n;
    
    int tmp;
    for (int i = 0; i < n; i++) {
        cin >> tmp;
        v.push_back(tmp);
    }
    
    double total = accumulate(v.begin(), v.end(), 0);
    
    int r=0;
    if (total == 0) {
        r = v.size() * 30;
    } else {
        for (int i = 0; i < n; i++) {
            if (v[i] / total <= 0.1) {
                r += 30;    
            }
        }    
    }
    
    cout << r << endl;
    
    return 0;
}