import java.util.*;
import java.io.*;
import java.math.*;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner reader = new Scanner(System.in);
        int n = reader.nextInt();
        BigInteger A = BigInteger.valueOf(1);
        for(int i = 0; i < n; i++) {
            BigInteger a = new BigInteger(reader.next());
            A = A.multiply(a);
        }
        int m = reader.nextInt();
        BigInteger B = BigInteger.valueOf(1);
        for(int i = 0; i < m; i++) {
            BigInteger b = new BigInteger(reader.next());
            B = B.multiply(b);
        }
        A = A.gcd(B);
        String ans = A.toString();
        if(ans.length() <= 9) System.out.println(ans);
        else {
            StringBuilder s = new StringBuilder();
            StringBuilder ss = new StringBuilder(ans);
            ss.reverse();
            for(int i = 0; i < 9; i++) {
                s.append(ss.charAt(i));
            }
            s.reverse();
            System.out.println(s.toString());
        }
    }
}