#include <iostream>
#include <utility>

using namespace std;

int main (void){
	int  N      = 0, M = 0;
	int  P[200] = { 0 }, Q[200] = { 0 };
	bool cup[3] = { false };

	// input
	cin >> N >> M;

	for(int i = 0; i < M; i++){
		cin >> P[i] >> Q[i];
	}

	// solve
	for(int i = 0; i < 3; i++){
		if(i == (N - 1)){
			cup[i] = true;
		}
		else{ cup[i] = false; }
	}
	for(int i = 0; i < M; i++){
		swap(cup[P[i] - 1], cup[Q[i] - 1]);
	}
	// output
	for(int i = 0; i < 3; i++){
		if(cup[i]){
			cout << i + 1 << endl;
		}
	}

	return 0;
}