#include<bits/stdc++.h>
#include<atcoder/all>

#define fi first
#define se second
#define eb emplace_back

using namespace std;
using namespace atcoder;
using ll = long long;

int main() {
    int N; cin >> N;
    vector<ll> A(N);
    for (int i = 0; i < N; ++i) cin >> A[i];

    sort(A.rbegin(), A.rend());

    ll ans = A[0];
    for (int i = 1; i < N; ++i) {
        if (i % 2) ans *= A[i];
        else ans = (ans + A[i] - 1) / A[i];
    }

    cout << ans << endl;
    return 0;
}