#include <iostream>
#include <algorithm>
using namespace std;

int main() {
  int n, m;
  cin >> n >> m;
  bool cup[3] = {false, false, false};
  cup[n - 1] = true;
  for (int i = 0; i < m; ++i) {
    int p, q;
    cin >> p >> q;
    swap(cup[p - 1], cup[q - 1]);
  }
  for (int i = 0; i < 3; ++i) {
    if (cup[i]) {
      cout << i + 1<< endl;
      break;
    }
  } 
  return 0;
}