import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int N = sc.nextInt() - 1;
		final int M = sc.nextInt();
		
		boolean[] in = new boolean[3];
		in[N] = true;
		
		for(int i = 0; i < M; i++){
			final int P = sc.nextInt() - 1;
			final int Q = sc.nextInt() - 1;
			
			final boolean tmp = in[P];
			in[P] = in[Q];
			in[Q] = tmp;
		}
		
		for(int i = 0; i < 3; i++){
			if(in[i]){
				System.out.println((i + 1));
				break;
			}
		}
		
	}
	
}