#include <iostream>
#include <algorithm>
#include <functional>
#define int long long
using namespace std;

int n;
int a[100000];

signed main() {
	int i;
	
	cin >> n;
	for (i = 0; i < n; i++) cin >> a[i];
	sort(a, a + n, greater<int>());
	
	int ans = a[0];
	for (i = 1; i < n; i++) {
		if (i % 2) ans *= a[i];
		else ans = (ans + a[i] - 1) / a[i];
	}
	
	cout << ans << endl;
	return 0;
}