// 河南省实验中学 高中 21级 关天泽

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define re register

const int N = 0x3f3f3f;
using namespace std;

int a[1000050], b[1000050], p, q, n; 

int main(){
	freopen("XORcipher.in", "r", stdin);
	freopen("XORcipher.out", "w", stdout);
	cin >> n;
	for (int i = 1; i <= n; i++){
		cin >> a[i];
		p ^= a[i];
	} 
	for (int i = 1; i <= n; i++){
		cin >> b[i];
		q ^= b[i];
	}
	cout << (p ^ q);
	return 0;
}