MINPRODUCT

#include<bits/stdc++.h>
using namespace std;
/// from HUNG MINE with love <3
int n, a[1000001];
void inline read (int &x) {
      int flag = 1;
      x = 0;
      char c = getchar ();//cout << c << "\n";
      while (c < '0' || c > '9') {
            if (c == '-') {
                  flag = -1;
            }
            c = getchar ();
      }
      while (c >= '0' && c <= '9') {
            x = x * 10 + (c - '0');
            c = getchar ();
      }
      x *= flag;//cerr << x;

}
int main () {
//      if (fopen ("test.inp", "r")) {
//            freopen ("test.inp", "r", stdin);
//      }
      {
            freopen ("MINPRODUCT.inp", "r", stdin);
            freopen ("MINPRODUCT.out", "w", stdout);
      }

      ios_base :: sync_with_stdio (0);
      cin.tie (0);
      cout.tie (0);
      read (n);//cerr << n;
      for (int i = 1; i <= n; ++ i) {
            read (a[i]);
      }
      sort (a + 1, a + n + 1);
      if (a[1] < 0 && a[n] > 0) return cout << a[1] * a[n], 0;
      if (a[n] <= 0) return cout << a[n - 1] * a[n], 0;
      if (a[1] >= 0) return cout << a[1] * a[2], 0;
}