#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset


using namespace std;

int main() {

	vector<int> A(4);

	int N;
	cin >> N;

	A[N]++;

	int M;
	cin >> M;
	for (int i = 0; i < M; i++) {
		int p, q;
		cin >> p >> q;
		swap(A[p], A[q]);
	}

	for (int i = 1; i < 4; i++) {
		if (A[i] == 1) {
			cout << i << endl;
			break;
		}
	}

	return 0;

}