#include using namespace std; #define FOR(i,a,b) for(int i=(a);i<(b);i++) #define REP(i,n) FOR(i,0,n) #define ALL(v) (v).begin(),(v).end() template inline bool chmax(A &a, B b) { if (a inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; } typedef unsigned long long ull; typedef long long ll; typedef pair pii; typedef pair pll; typedef pair P; const ll INF = 1ll<<60; const ll MOD = 1000000007; const double EPS = 1e-10; int n; int a[16]; int main() { cin >> n; REP(i, n) scanf("%d", a + i); ll ans = -INF; REP(rev, n) REP(rev2, n) { REP(s, 1 << n) { int nec = 0; //今までの負の数 ll now = a[0]; FOR(i, 1, n) { if (a[i] == 0) continue; if (s >> i & 1) { if (a[i] < 0 || rev == i || rev2 == i) now -= a[i]; else now += a[i]; } else now *= a[i]; } chmax(ans, now); } } cout << ans << endl; return 0; }