#include <bits/stdc++.h>

using namespace std;

int main(void) {
  int n;
  cin >> n;

  vector<int> c(n);
  int sumc = 0;
  for (int i = 0; i < n; i++) {
    cin >> c[i];
    sumc += c[i];
  }
  sort(c.begin(), c.end());

  cout << (upper_bound(c.begin(), c.end(), sumc / 10) - c.begin()) * 30 << endl;

  return 0;
}