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 Go (1.14.1) (judge verdict: Wrong Answer)

package main

import (
	"fmt"
	"os"
)

func main() {
	var N, A int64
	fmt.Scan(&N)
	As := make([]int64, N)

	var res int64
	res = 1
	for i := 0; i < int(N); i++ {
		fmt.Scan(&A)
		As[i] = A
		if A == 0 {
			fmt.Println(0)
			os.Exit(0)
		}
	}

	for i := 0; i < int(N); i++ {
		n := As[i]
		res = add(res, n)
		if res == -1 {
			break;
		}
		if res > 1000000000000000000 || res < 0 {
			res = -1
			break;
		}

	}
	
	fmt.Println(res)

}

func add(a,b int64) (res int64) {
	
    defer func() {
        err := recover()
        if err != nil {
            res = -1
		}
    }()
	
	res = a*b
	return res
}