//

import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		int a = sc.nextInt(); int b = sc.nextInt();
		int ans = 3;
		if (a<=23 && 23<=b) ans--;
		if (a<=24 && 24<=b) ans--;
		if (a<=25 && 25<=b) ans--;
		System.out.println(ans);
		
	}
}