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

int base;

map<pair<int, int>, ll> mem;
// I have no idea how this works, just started messing around with formulas on
// OEIS and got this working

// calculates the number of `d` digits used from `1..n`
ll pog(ll n, int d) {
  if (n <= 0)
    return 0;
  if (mem.count({n, d})) {
    return mem.at({n, d});
  }
  ll r = n % base;
  ll q = n / base;
  ll res = q + (r + 1) * pog(q, d) + (base - r - 1) * pog(q - 1, d);
  if (d != 0 && r >= d) {
    res++;
  }
  return mem[make_pair(n, d)] = res;
}

int main() {
  cin >> base;
  vector<ll> budget(base);
  for (auto &b : budget)
    cin >> b;
  auto is_enough = [&](int n) {
    for (int i = 0; i < base; i++) {
      ll a = pog(n, i);
      if (a > budget[i])
        return false;
    }
    return true;
  };

  ll curr = 0;
  for (int i = 20; i >= 0; i--) {
    ll next = curr + (1ll << i);
    if (is_enough(next)) {
      curr = next;
    }
  }
  cout << curr;
}