import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    }
} 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 result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    } main {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc long result = 1; result 1 for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        } int i=0; int i=0; i 0 i<n i n i++ i++ i {
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        } {
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        } long input = sc.nextLong(); input sc.nextLong() sc.nextLong sc if (input == 0) { result = 0; break;} input == 0 input 0 { result = 0; break;} result = 0 result 0 break; if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            } result > 1000000000000000000L/input || result == -1 result > 1000000000000000000L/input result 1000000000000000000L/input 1000000000000000000L input result == -1 result -1 1 {
                result = -1;
            } result = -1 result -1 1 {
                result = result * input;
            } result = result * input result result * input result input System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    }
} Main
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long result = 1;

        for (int i=0;i<n;i++){
            long input = sc.nextLong();
            if (input == 0) { result = 0; break;}

            if (result > 1000000000000000000L/input || result == -1) {
                result = -1;
            } else {
                result = result * input;
            }
        }

        System.out.println(result);
    }
}