import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int[] t = new int[3];
		t[sc.nextInt() - 1] = 1;
		int n = sc.nextInt(), a, b, tmp;
		for (int i = 0; i < n; i++) {
			a = sc.nextInt() - 1;
			b = sc.nextInt() - 1;
			tmp = t[a];
			t[a] = t[b];
			t[b] = tmp;
		}
		for (int i = 0; i < 3; i++) {
			if (t[i] == 1) {
				System.out.println(i + 1);
				return;
			}
		}
	}
}