#include <bits/stdc++.h>
using namespace std;
int main(){
  cin.tie(nullptr)->sync_with_stdio(false);
  int pos, M; cin >> pos >> M;
  for(int i = 0; i < M; ++i){
    int a, b; cin >> a >> b;
    if(a == pos){
      pos = b;
    } else if(b == pos){
      pos = a;
    } 
  }
  cout << pos << endl;
  return 0;
}