import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    long ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          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 ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      }
    }
    System.out.println(ans);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    long ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      }
    }
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    long ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          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 ans = 1; ans 1 for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      }
    } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      }
    } {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      }
    } long a = sc.nextLong(); a sc.nextLong() sc.nextLong sc if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      } a == 0 a 0 {
        ans = 0;
      } ans = 0 ans 0 {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      } if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        } ans <= ((long)Math.pow(10, 18) / a) ans ((long)Math.pow(10, 18) / a) (long)Math.pow(10, 18) Math.pow Math 10 18 a {
          if(ans >= 0) ans *= a;
        } if(ans >= 0) ans *= a; ans >= 0 ans 0 ans *= a ans a {
          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 ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          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 ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          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 ans = 1;
    for(int i = 0; i < n; i++) {
      long a = sc.nextLong();
      if(a == 0) {
        ans = 0;
      } else {
        if(ans <= ((long)Math.pow(10, 18) / a)) {
          if(ans >= 0) ans *= a;
        } else {
          ans = -1;
        }
      }
    }
    System.out.println(ans);
  }
}