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];
		long ans = 1;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			ans = -1;
		}
		System.out.println(ans);
	}
} 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];
		long ans = 1;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			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;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			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;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			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 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 Arrays.sort(A) Arrays.sort Arrays A for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		} {
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		} if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			} A[i] == 0 A[i] A i 0 {
				ans = 0;
				break;
			} ans = 0 ans 0 break; if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			} A[i] <= 1000000000000000000L / ans A[i] A i 1000000000000000000L / ans 1000000000000000000L ans {
				ans *= A[i];
			} ans *= A[i] ans A[i] A i {
				ans = -1;
				break;
			} ans = -1 ans -1 1 break; if(ans > 1000000000000000000L){
			ans = -1;
		} ans > 1000000000000000000L ans 1000000000000000000L {
			ans = -1;
		} ans = -1 ans -1 1 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;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			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;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			ans = -1;
		}
		System.out.println(ans);
	}
} 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];
		long ans = 1;
		for(int i = 0;i < N;i++){
			A[i] = sc.nextLong();
		}
		Arrays.sort(A);
		for(int i = 0;i < N;i++){
			if(A[i] == 0){
				ans = 0;
				break;
			}else if(A[i] <= 1000000000000000000L / ans){
				ans *= A[i];
			}else{
				ans = -1;
				break;
			}
		}
		if(ans > 1000000000000000000L){
			ans = -1;
		}
		System.out.println(ans);
	}
}