#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"

int main() {
    int n;
    cin >> n;
    int sum = 0;
    vector<int> c(n);
    for (int i = 0; i < n; ++i) {
        int x;
        cin >> x;
        sum += x;
        c[i] = x;
    }
    int ave = sum / 10;
    int cnt = 0;
    for (int i = 0; i < n; ++i) {
        if (c[i] <= ave) cnt++;
    }
    cout << 30 * cnt << endl;

    return 0;
}