Problem:
Score : 200 points

Problem Statement

Given N integers A_1, ..., A_N, compute A_1 \times ... \times A_N.

However, if the result exceeds 10^{18}, print -1 instead.

Constraints

2 \leq N \leq 10^5

0 \leq A_i \leq 10^{18}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 ... A_N

Output

Print the value A_1 \times ... \times A_N as an integer, or -1 if the value exceeds 10^{18}.

Sample Input 1

2
1000000000 1000000000

Sample Output 1

1000000000000000000

We have 1000000000 \times 1000000000 = 1000000000000000000.

Sample Input 2

3
101 9901 999999000001

Sample Output 2

-1

We have 101 \times 9901 \times 999999000001 = 1000000000000000001, which exceeds 10^{18}, so we should print -1 instead.

Sample Input 3

31
4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6 2 6 4 3 3 8 3 2 7 9 5 0

Sample Output 3

0

Solution in Fortran (GNU Fortran 9.2.1) (judge verdict: Accepted)

program multiplication2
  implicit none
  integer(16), parameter :: u = 10_16**18
  integer :: n, i
  integer(16) :: a(100000) = 0, x = 1
  read(*,*) n
  read(*,*) a(1:n)
  if (minval(a(1:n)) == 0) then
    write(*,'(i0)') 0
    stop
  end if
  do i = 1, n
    x = x*a(i)
    if (x > u) then
      write(*,'(i0)') -1
      stop
    end if
  end do
  write(*,'(i0)') x
end program multiplication2