import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String args[]) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
    public static void main(String args[]) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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[]) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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 {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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);
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) long n = Long.parseLong(br.readLine()); n Long.parseLong(br.readLine()) Long.parseLong Long br.readLine() br.readLine br String array[] = br.readLine().split(" "); array br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " long ans = 1; ans 1 for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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 = Long.parseLong(array[i]);
	    if (a == 0) {
		ans = 0;
	    } else {
		if (ans <= (long) Math.pow(10, 18) / a) {
		    if (ans >= 0)
			ans *= a;
		} else {
		    ans = -1;
		}
	    }

	} {
	    long a = Long.parseLong(array[i]);
	    if (a == 0) {
		ans = 0;
	    } else {
		if (ans <= (long) Math.pow(10, 18) / a) {
		    if (ans >= 0)
			ans *= a;
		} else {
		    ans = -1;
		}
	    }

	} long a = Long.parseLong(array[i]); a Long.parseLong(array[i]) Long.parseLong Long array[i] array i 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[]) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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[]) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String args[]) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	long n = Long.parseLong(br.readLine());
	String array[] = br.readLine().split(" ");
	long ans = 1;
	for (int i = 0; i < n; i++) {
	    long a = Long.parseLong(array[i]);
	    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);
    }
}
