import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int M = sc.nextInt();
    int[] arr = new int[3];
    arr[N - 1] = 1;
    for(int i = 0; i < M; i++) {
      int p = sc.nextInt() - 1;
      int q = sc.nextInt() - 1;
      int temp = arr[p];
      arr[p] = arr[q];
      arr[q] = temp;
    }
    int ans = 0;
    for(int i = 0; i < 3; i++) {
      if(arr[i] == 1) ans = i + 1;
    }
    System.out.println(ans);
  }
}