import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		long[] a = new long[n];
		
		for(int i = 0; i < n; i++) {
			a[i] = sc.nextLong();
		}
		
		long sum = 1;
		long max = 1000000000000000000l;
		boolean chk = false;
		boolean zero = false;
		
		for(int i = 0; i < n; i++) {
			if(sum!= 0 && max / sum < a[i]) {
				chk = true;
			}
			if(a[i] == 0) {
				sum = 0;
				zero = true;
				break;
			}else {
				sum*= a[i];
			}
		}
		
		if( zero ) {
			System.out.println(0);
		}else if( chk ){
			System.out.println(-1);
		}else {
			System.out.println(sum);
		}
	}
}
/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