#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  ll n;
  cin >> n;
  ll ans = 0;
  ll c[n], c_sum = 0;
  for (ll i = 0; i < n; ++i) {
    cin >> c[i];
    c_sum += c[i];
  }
  for (ll i = 0; i < n; ++i) {
    if (c[i] * 10 <= c_sum) ans++;
  }
  cout << ans * 30 << endl;
  return 0;
}