#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n,m,a,b;
  cin>>n>>m;
  vector<bool> hoge(3,false);
  hoge[n-1]=true;
  rep(i,m){
    cin>>a>>b;
    swap(hoge[a-1],hoge[b-1]);
  }
  rep(i,3){
    if(hoge[i]){
      cout<<i+1<<endl;
      break;
    }
  }
}