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 Kotlin (1.3.71) (judge verdict: Accepted)

fun longList() = readLine()?.split(" ")?.map(String::toLong) ?: TODO()
fun main(args: Array<String>) {
    val n = readLine()?.toInt() ?: return
    val a = longList()
    if (a.find { it == 0L } != null) {
        println("0")
        return
    }
    var t = 1L
    val max = 1e18.toLong()
    var prev = 1L
    a.forEach {
        t *= it
        if(prev > t) {
            println("-1")
            return
        }
        if (max < t) {
            println("-1")
            return
        }
        prev = t
    }
    println(t.toString())
}