package main import ( "bufio" "fmt" "os" "sort" "strconv" ) var sc = bufio.NewScanner(os.Stdin) var wr = bufio.NewWriter(os.Stdout) func out(x ...interface{}) { fmt.Fprintln(wr, x...) } func getI() int { sc.Scan() i, e := strconv.Atoi(sc.Text()) if e != nil { panic(e) } return i } func getF() float64 { sc.Scan() i, e := strconv.ParseFloat(sc.Text(), 64) if e != nil { panic(e) } return i } func getInts(N int) []int { ret := make([]int, N) for i := 0; i < N; i++ { ret[i] = getI() } return ret } func getS() string { sc.Scan() return sc.Text() } // min, max, asub, absなど基本関数 func max(a, b int) int { if a > b { return a } return b } func min(a, b int) int { if a < b { return a } return b } func asub(a, b int) int { if a > b { return a - b } return b - a } func abs(a int) int { if a >= 0 { return a } return -a } func lowerBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] >= x }) return idx } func upperBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] > x }) return idx } const inf = int(1e18) func main() { defer wr.Flush() sc.Split(bufio.ScanWords) sc.Buffer([]byte{}, 1000000) // this template is new version. // use getI(), getS(), getInts(), getF() N := getI() a := getInts(N) N0 := min(11, N) N1 := max(0, N-N0) x := 1 for i := 0; i < N0-1; i++ { x *= 4 } m := make(map[int]bool, 0) ans := -inf for i := 0; i < x; i++ { n := i tot := a[0] for j := 1; j < N0; j++ { op := n % 4 switch op { case 0: tot += a[j] case 1: tot -= a[j] case 2: tot *= a[j] case 3: if a[j] == 0 { tot += a[j] } else { tot /= a[j] } } n /= 4 } m[tot] = true ans = max(ans, tot) } if N1 == 0 { out(ans) return } x = 1 for i := 0; i < N1; i++ { x *= 4 } ans = -inf for e := range m { for i := 0; i < x; i++ { n := i tot := e // fmt.Print(e) for j := N0; j < N; j++ { op := n % 4 switch op { case 0: // fmt.Print("+", a[j]) tot += a[j] case 1: // fmt.Print("-", a[j]) tot -= a[j] case 2: // fmt.Print("*", a[j]) tot *= a[j] case 3: if a[j] == 0 { // fmt.Print(".", a[j]) tot += a[j] } else { // fmt.Print("/", a[j]) tot /= a[j] } } n /= 4 } // fmt.Println("=", tot) ans = max(ans, tot) } } out(ans) }