using System;

using System.Linq;

// you can also use other imports, for example:

// using System.Collections.Generic;

​

// you can write to stdout for debugging purposes, e.g.

// Console.WriteLine("this is a debug message");

​

public class Solution {

    public static void Main() {

        var solution = new Solution();

        Console.WriteLine(solution.solution(new int[] {100,100,100,100,100}) == 1);

        Console.WriteLine(solution.solution(new int[] {100,100,0,100,100}) == 0);

        Console.WriteLine(solution.solution(new int[] {-100,100,-100,-100,100}) == -1);

        Console.WriteLine(solution.solution(new int[] {-100,100,-100,-100,-100}) == 1);

    }

    public int solution(int[] A) {

        // write your code in C# 6.0 with .NET 4.5 (Mono)

        int result=1;

        int output;

​

        for(int i=0;i<A.Length;i++){

            result *= A[i];

        }

​

        if(result==0){

            output =0;

        }

        else if(result<0){

            output=-1;

        }

        else{

            output=1;

        }

​

        return output;

    }

}