import java.util.Arrays;
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();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  System.out.println(sum);
  }
}
 import java.util.Arrays; Arrays java.util 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];
	  for(int i=0;i<n;i++)a[i]=sc.nextLong();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  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();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  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();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  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] a i sc.nextLong() sc.nextLong sc Arrays.sort(a) Arrays.sort Arrays a long sum=1; sum 1 for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  } int i=0; int i=0; i 0 i<n i n i++ i++ i {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  } {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  } try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  } catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  } ArithmeticException e {
			  System.out.println(-1);
			  System.exit(0);
		  } System.out.println(-1) System.out.println System.out System System.out -1 1 System.exit(0) System.exit System 0 {
			  sum=Math.multiplyExact(sum, a[i]);
		  } sum=Math.multiplyExact(sum, a[i]) sum Math.multiplyExact(sum, a[i]) Math.multiplyExact Math sum a[i] a i if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  } sum>1000000000000000000L sum 1000000000000000000L {
			  System.out.println(-1);
			  System.exit(0);
		  } System.out.println(-1) System.out.println System.out System System.out -1 1 System.exit(0) System.exit System 0 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();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  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();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  System.out.println(sum);
  }
} Main
import java.util.Arrays;
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();
	  Arrays.sort(a);
	  long sum=1;
	  for(int i=0;i<n;i++) {
		  try{
			  sum=Math.multiplyExact(sum, a[i]);
		  }catch(ArithmeticException e){
			  System.out.println(-1);
			  System.exit(0);
		  }
		  if(sum>1000000000000000000L) {
			  System.out.println(-1);
			  System.exit(0);
		  }
	  }
	  System.out.println(sum);
  }
}

