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)

import kotlin.system.exitProcess

fun main(args: Array<String>) {
    readLine()
    val nums = readLine()!!.split(" ").map { it.toBigDecimal() }.toMutableList()

    var ans = 1.toBigDecimal()

    // 0考慮
    if (nums.contains(0.toBigDecimal())) {
        print("0")
        exitProcess(0)
    }

    for (num in nums) {
        ans *= num

        // 早めに切り上げる
        if (ans > 1000000000000000000.toBigDecimal()) {
            println("-1")
            exitProcess(0)
        }
    }

    if (ans > 1000000000000000000.toBigDecimal()) {
        println("-1")
    } else {
        println(ans)
    }
}