import java.util.Scanner;

public class Yukicoder26 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		int P, Q;
		boolean[] cup = {false, false, false};
		cup[N - 1] = true;

		for (int i = 0; i < M; i++) {
			P = sc.nextInt();
			Q = sc.nextInt();
			cup[P - 1] ^= cup[Q - 1];
			cup[Q - 1] ^= cup[P - 1];
			cup[P - 1] ^= cup[Q - 1];
		}
		
		for (int i = 0; i < 3; i++)
			if (cup[i])
				System.out.println(i + 1);

	}
}