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];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    }    
} import java.util.Scanner; Scanner 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];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    }    
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        long A[] = new long[N];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    } main {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        long A[] = new long[N];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    } 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 long ans = 1; ans 1 int zero = 2; zero 2 for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        } {
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        } A[i] = sc.nextLong() A[i] A i sc.nextLong() sc.nextLong sc if(A[i] == 0){
                zero = 0;
                break;
            } A[i] == 0 A[i] A i 0 {
                zero = 0;
                break;
            } zero = 0 zero 0 break; try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        } catch(ArithmeticException e){
            ans = -1;
        } ArithmeticException e {
            ans = -1;
        } ans = -1 ans -1 1 {
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        } if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        } zero == 0 zero 0 {
            ans = 0;
        } ans = 0 ans 0 {for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        } for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            } {
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            } ans = Math.multiplyExact(ans, A[i]) ans Math.multiplyExact(ans, A[i]) Math.multiplyExact Math ans A[i] A i if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                } ans > 1000000000000000000L ans 1000000000000000000L {
                    ans = -1;
                    break;
                } ans = -1 ans -1 1 break; System.out.println(ans) System.out.println System.out System System.out ans 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];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    }    
} public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        long A[] = new long[N];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    }    
} Main
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];
        long ans = 1;
        int zero = 2;
        
        for(int i = 0; i < N ; i++){
            A[i] = sc.nextLong();
            if(A[i] == 0){
                zero = 0;
                break;
            }
        }
        try{
        if(zero == 0){
            ans = 0;
        }else{for(int i = 0; i < N ; i++){
            ans = Math.multiplyExact(ans, A[i]);
                if(ans > 1000000000000000000L){
                    ans = -1;
                    break;
                }
            }
        }
        }catch(ArithmeticException e){
            ans = -1;
        }
        System.out.println(ans);
        
        
    }    
}