#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N;
  int sum = 0, chk, ans = 0;
  cin >> N;
  vector<int> v(N);
  rep(i, 0, N) {
    cin >> v[i];
    sum += v[i];
  }
  chk = sum / 10;
  rep(i, 0, N) {
    if (v[i] <= chk) ans++;
  }
  cout << ans * 30 << endl;
  getchar();
}