package main
import (
  "fmt"
  "math"
)
  
func main() {
  var n int
  fmt.Scan(&n)
  var a[20]int64
  for i:=0;i<n;i++ {
    fmt.Scan(&a[i])
  }
  var dp[20][2] int64
  for i:=0;i<n;i++ {
    dp[i][0]=1<<60
    dp[i][1]=-(1<<60)
  }
  dp[0][0]=a[0]
  dp[0][1]=a[0]
  for i:=1;i<n;i++ {
    for j:=0;j<2;j++ {
      dp[i][0]=int64(math.Min(float64(dp[i][0]),float64(dp[i-1][j]+a[i])))
      dp[i][0]=int64(math.Min(float64(dp[i][0]),float64(dp[i-1][j]-a[i])))
      dp[i][0]=int64(math.Min(float64(dp[i][0]),float64(dp[i-1][j]*a[i])))
      dp[i][1]=int64(math.Max(float64(dp[i][1]),float64(dp[i-1][j]+a[i])))
      dp[i][1]=int64(math.Max(float64(dp[i][1]),float64(dp[i-1][j]-a[i])))
      dp[i][1]=int64(math.Max(float64(dp[i][1]),float64(dp[i-1][j]*a[i])))
      if a[i]!=0 {
        dp[i][0]=int64(math.Min(float64(dp[i][0]),float64(dp[i-1][j]/a[i])))
        dp[i][1]=int64(math.Max(float64(dp[i][1]),float64(dp[i-1][j]/a[i])))
      }
    }
  }
  fmt.Println(int(dp[n-1][1]))
}