import java.util.*;
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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    }
} import java.util.*; util.* java 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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    }
} 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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    } main {
    	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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc long[] A = new long[N]; A new long[N] N for(int i = 0; i < N; i ++){
			A[i] = sc.nextLong();
		} int i = 0; int i = 0; i 0 i < N i N i ++ i ++ i {
			A[i] = sc.nextLong();
		} {
			A[i] = sc.nextLong();
		} A[i] = sc.nextLong() A[i] A i sc.nextLong() sc.nextLong sc long sum = 1L; sum 1L long max = (long)Math.pow(10, 18); max (long)Math.pow(10, 18) Math.pow Math 10 18 for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		} int i = 0; int i = 0; i 0 i < N i N i ++ i ++ i {
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		} {
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		} if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			} A[i] == 0 A[i] A i 0 {
				sum = 0;
				break;
			} sum = 0 sum 0 break; if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			} A[i] > max / sum A[i] A i max / sum max sum {
				sum = -1;
			} sum = -1 sum -1 1 {
			sum *= A[i];
			} sum *= A[i] sum A[i] A i System.out.println(sum) System.out.println System.out System System.out sum String[] args args 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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    }
} 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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    }
} Main
import java.util.*;
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 = 1L;
		long max = (long)Math.pow(10, 18);
		for(int i = 0; i < N; i ++){
			if(A[i] == 0){
				sum = 0;
				break;
			}else if(A[i] > max / sum){
				sum = -1;
			}else{
			sum *= A[i];
			}
		}
		System.out.println(sum);
    }
}
