#define __USE_MINGW_ANSI_STDIO 0
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MP make_pair
#define PB push_back
#define MOD 1000000007
#define INF (1LL<<30)
#define LLINF (1LL<<60)
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

int dp[20];
signed main(void)
{
	int n, a[20];
	cin >> n;
	REP(i, n) cin >> a[i];

	dp[0] = a[0];
	FOR(i, 1, n) {
		dp[i] = max(dp[i], dp[i-1]+a[i]);
		dp[i] = max(dp[i], dp[i-1]*a[i]);
		dp[i] = max(dp[i], dp[i-1]-a[i]);
		dp[i] = max(dp[i], dp[i-1]/a[i]);
	}
	cout << dp[n-1] << endl;
	return 0;
}