#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int N;
  cin >> N;
  double th = 0;
  vector<int> C(N);
  for (int i = 0; i < N; i++) {
    cin >> C[i];
    th += C[i];
  }
  th /= 10;
  int res = 0;
  for (int i = 0; i < N; i++) {
    if (th >= C[i]) res++;
  }
  cout << res * 30 << '\n';
  return 0;
}