package main import . "fmt" import . "slices" func main() { var n int Scan(&n) a:=make([]int,n) for i:=range a { Scan(&a[i]) } max:=Max(a) min:=Min(a) ans:=0 if max>0 { ans+=max*2 } if min<0 { ans-=min*2 } Println(ans) }