import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int N = sc.nextInt();
		final int M = sc.nextInt();
		
		final int min = Math.min(N, M);
		final int max = Math.max(N, M);
		
		if(min % 2 == max % 2){
			System.out.println(min);
		}else{
			System.out.println(1);
		}
		
	}
	
}