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 sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  }
} 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 sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  }
} Main public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    long[] A = new long[N];
    long sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  } main {
    
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    long[] A = new long[N];
    long sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  } 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 sum = 1; sum 1 for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } A[i] = sc.nextLong() A[i] A i sc.nextLong() sc.nextLong sc if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / 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] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      } A[i] > (1000000000000000000L / sum) A[i] A i (1000000000000000000L / sum) 1000000000000000000L 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 sc.close() sc.close sc 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 sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  }
} 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 sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  }
} 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 sum = 1;
    
    for (int i = 0; i < N; i++) {
      A[i] = sc.nextLong();
      if (A[i] == 0) {
        sum = 0;
        break;
      } else if (A[i] > (1000000000000000000L / sum)) {
        sum = -1;
      } else {
        sum *= A[i];
      }
    } 
      System.out.println(sum);
                 
      sc.close();
  }
}
