#include #include #include #include #include #include #include #include using namespace std; #define GET_ARG(a,b,c,F,...) F #define REP3(i,s,e) for (i = s; i <= e; i++) #define REP2(i,n) REP3 (i,0,(int)(n)-1) #define REP(...) GET_ARG (__VA_ARGS__,REP3,REP2) (__VA_ARGS__) #define RREP3(i,s,e) for (i = s; i >= e; i--) #define RREP2(i,n) RREP3 (i,(int)(n)-1,0) #define RREP(...) GET_ARG (__VA_ARGS__,RREP3,RREP2) (__VA_ARGS__) #define DEBUG(x) cerr << #x ": " << x << endl typedef long long ll; int a[16]; ll dfs(int i, int n, ll x) { if (i == n) return x; ll ret = -1e9; ret = max(ret,dfs(i+1,n,x+a[i])); ret = max(ret,dfs(i+1,n,x-a[i])); ret = max(ret,dfs(i+1,n,x*a[i])); return ret; } int main(void) { int i, n; cin >> n; REP (i,n) cin >> a[i]; cout << dfs(1,n,a[0]) << endl; return 0; }