package me.yukicoder.lv1;

import java.util.Scanner;

public class No0026 {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in);) {
			int N = sc.nextInt();
			int M = sc.nextInt();
			boolean[] cup = new boolean[3];
			cup[N - 1] = true;// 最初に○印が付いているカップ

			for (int i = 0; i < M; i++) {
				int p = sc.nextInt();
				int q = sc.nextInt();
				exchange(cup, p, q);
			}

			System.out.println(cnt(cup));
		}
	}

	static void exchange(boolean[] cup, int p, int q) {
		boolean boo = cup[p - 1];
		cup[p - 1] = cup[q - 1];
		cup[q - 1] = boo;
	}

	static int cnt(boolean[] cup) {
		int cnt;
		for (cnt = 0; cnt < cup.length; cnt++) {
			if (cup[cnt])
				break;
		}
		return cnt + 1;
	}
}