#include <bits/stdc++.h>

using namespace std;

int main()
{
    int N;
    cin >> N;
    int C[N], total = 0, cnt = 0;
    for (int i = 0; i < N; i++)
    {
        cin >> C[i];
        total += C[i];
    }
    total /= 10;

    for (int i = 0; i < N; i++)
    {
        if (total > C[i]) cnt++;
    }
    cout << cnt * 30 << endl;
}