#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int N, M;
  cin >> N >> M;
  N--;
  vector<bool> mark(3, false);
  mark[N] = true;
  for (int i = 0; i < M; i++) {
    int p, q;
    cin >> p >> q;
    p--, q--;
    bool tmp = mark[p];
    mark[p] = mark[q];
    mark[q] = tmp;
  }
  for (int i = 0; i < 3; i++) {
    if (mark[i]) cout << i + 1 << '\n';
  }
  return 0;
}