#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  vector<int> C(N);
  int x = 0, y = 0;
  for (int i = 0; i < N; i++) {
    cin >> C.at(i);
    x += C.at(i) / 10;
  }
  while (N--) if (C.at(N) <= x) y++;
  cout << y * 30 << "\n";
}