#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<stack>
#include<cmath>
#include<cstdlib>
#include<ctime>
using namespace std;
typedef long long ll;
bool a[3];
int main() {
	int n, m;
	cin >> n >> m;
	a[n - 1] = true;
	for (int i = 0; i < m; i++) {
		int r, c;
		cin >> r >> c;
		swap(a[r - 1], a[c - 1]);
	}
	for (int i = 0; i < 3; i++)if (a[i])cout << i + 1 << endl;
	return 0;
}