#include <bits/stdc++.h>

using namespace std;

int C[100];

int main()
{
    int N; cin >> N;
    
    int sum = 0;

    for (int i = 0; i < N; ++i) {
        cin >> C[i];
        sum += C[i];
    }

    int cnt = 0;

    for (int i = 0; i < N; ++i) {
        if (sum / 10.0 >= C[i]) cnt++;
    }

    cout << cnt * 30 << endl;
}