#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
const int INF = 1e9;

int N;
int a[20];
int dp[20][2];  //[i][0]min, [i][1]max

signed main()
{
    cin >> N;
    REP(i,N) cin >> a[i];
   
    REP(i,20) REP(j,2) {
        dp[i][j] = (j == 0 ? INF : -INF);
    }

    dp[0][0] = dp[0][1] = a[0];
    for (int i=1; i<N; i++) {
        REP(j,2) {
            dp[i][0] = min(dp[i][0], dp[i-1][j] + a[i]);
            dp[i][0] = min(dp[i][0], dp[i-1][j] - a[i]);
            dp[i][0] = min(dp[i][0], dp[i-1][j] * a[i]);
            if (a[i] != 0) {
                dp[i][0] = min(dp[i][0], dp[i-1][j] / a[i]);
            }
        }
        REP(j,2) {
            dp[i][1] = max(dp[i][1], dp[i-1][j] + a[i]);
            dp[i][1] = max(dp[i][1], dp[i-1][j] - a[i]);
            dp[i][1] = max(dp[i][1], dp[i-1][j] * a[i]);
            if (a[i] != 0) {
                dp[i][1] = max(dp[i][1], dp[i-1][j] / a[i]);
            }
        }
    }

    cout << dp[N-1][1] << endl;
}