#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> c(n);
    for (int &e : c) cin >> e;
    
    int all = accumulate(c.begin(), c.end(), 0);
    
    int ans = 0;
    for (const int &e : c) {
        ans += (all >= e * 10);
    }
    
    cout << ans * 30 << '\n';
    return 0;
}