import java.util.ArrayList;
import java.util.Scanner;
/**
* Created by LXF on 2017/9/21.
*/
public class yz {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n1 = scanner.nextInt();
int[] a1 = new int[n1];
for (int i = 0; i < n1; i++) {
a1[i] = scanner.nextInt();
}
int n2 = scanner.nextInt();
int[] a2 = new int[n2];
for (int i = 0; i < n2; i++) {
a2[i] = scanner.nextInt();
}
ArrayList dq = new ArrayList<>();
for (int i = 0, j = 0; i < n1 && j < n2; i++, j++) {
if (a1[i] < a2[j]) {
dq.add(a1[i]);
i++;
} else if (a1[i] > a2[j]) {
dq.add(a2[j]);
j++;
} else {
dq.add(a1[i]);
i++;
j++;
}
}
if (dq.size() % 2 == 1) {
System.out.println(dq.get(dq.size()/2+1));
}else {
System.out.println((dq.get(dq.size()/2)+dq.get(dq.size()/2+1))/2);
}
}
}