#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
typedef long long int ll;
using namespace std;
#define INF 1234567890
#define LIMIT 1
int sum, minnum=INF;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	int n;
	cin >> n;
	int ball[4] = {0,1,0,0};

	for (int i = 0; i < n; i++) {
		int x, y;
		cin >> x >> y;
		swap(ball[x], ball[y]);
	}
	for (int i = 1; i <= 3; i++) {
		if (ball[i]) cout << i;
	}
	

	return 0;
}