#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  int cnt = 0;
  int t = accumulate(a.begin(), a.end(), 0) / 10;
  rep(i, n) {
    if (a[i] <= t) cnt++;
  }
  cout << cnt * 30 << endl;
  return 0;
}