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

void Warding()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}

void solve()

{
    ll n, Maxx = 0;
    cin >> n;
    vector<ll> v(n);
    for (auto &i : v)
    {
        cin >> i;
    }
    for (int i = 0; i < n - 1; i++)
    {
        ll x = ((v[i] * v[i + 1]) / __gcd(v[i], v[i + 1]));
        Maxx = max(Maxx, x);
    }

    cout << Maxx << endl;
}

int main()
{
    Warding();
    int t;
    t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
}