/* -*- coding: utf-8 -*-
 *
 * 26.cc: No.26 シャッフルゲーム - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

bool cs[3];

/* subroutines */

/* main */

int main() {
  int n, m;
  cin >> n >> m;

  cs[n - 1] = true;
  
  for (int i = 0; i < m; i++) {
    int pi, qi;
    cin >> pi >> qi;
    pi--, qi--;
    swap(cs[pi], cs[qi]);
  }

  for (int i = 0; i < 3; i++)
    if (cs[i]) {
      printf("%d\n", i + 1);
      break;
    }
  return 0;
}