import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        boolean[] hasBall = new boolean[4];
        hasBall[sc.nextInt()] = true;
        int m = sc.nextInt();
        for (int i = 0; i < m; i++) {
            int left = sc.nextInt();
            int right = sc.nextInt();
            boolean tmp = hasBall[left];
            hasBall[left] = hasBall[right];
            hasBall[right] = tmp;
        }
        for (int i = 1; i < 4; i++) {
            if (hasBall[i]) {
                System.out.println(i);
                return;
            }
        }
    }
}