# include <iostream>
# include <iomanip>
# include <algorithm>

using namespace std;


int main()
{
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) cin >> a[i];

    int sum = 0;
    for (int i = 0; i < n; i++) {
        sum += a[i];
    }

    int line = sum / 10;
    sort(a, a+n);
    int i = 0;
    int money = 0;
    while (line >= a[i]) {
        money += 30;
        i++;
        if (i==n) break;
    }
    cout << money << endl;




}