import java.math.BigDecimal;
import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        BigDecimal[] a = new BigDecimal[n];
 
        BigDecimal result = new BigDecimal(1);
        BigDecimal max = new BigDecimal(1000000000000000000L);
        for(int i=0; i < n; i++){
            a[i] = sc.nextBigDecimal();
            if(a[i].compareTo(BigDecimal.ZERO) == 0) {
                System.out.println(0);
                return;
            }
        }
 
        for(int i=0; i < n; i++){
            result = result.multiply(a[i]);
            if(result.compareTo(max) > 0){
                System.out.println(-1);
                return;
            }
        }
 
        System.out.println(result);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz