#include<iostream>
using namespace std;
int main() {
	std::ios::sync_with_stdio(false);
	int a[32] = { 0 };
	unsigned int n, num, pos, ansnum = 0;
	int ans[32] = { 0 };
	cin >> n;
	//file >> n;
	for (int i = 0; i < 3 * n - 1; i++) {
		cin >> num;
		//file >> num;
		for (pos = 0; pos < 32; pos++) {
			if((num>>pos)&1)
				a[pos] += 1;
		}
	}
	for (int i = 0; i < 32; i++) {
		if (a[i] % 3) {
			ans[i] = 1;
		}
	}
	for (int i = 0; i < 32; i++) {
		ansnum *= 2;
		ansnum += ans[31-i];
	}
	cout << ansnum;
}