백준 1547

#include <iostream>
using namespace std;


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

	int input = 0;
	cin >> input;

	int cups[4] = {0, 1,2,3 };

	int ball = 1;

	for (int i = 0; i < input; ++i)
	{
		int a, b;
		cin >> a >> b;


		if (a == ball && b != ball)
		{
			ball = cups[b];
		}
		else if (a != ball && b == ball)
		{
			ball = cups[a];
		}


	}

	cout << ball;
	return 0;
}