#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	int A,B;
	cin>>A>>B;
	int ans=3;
	if (A<=23 && 23<=B){
		ans--;
	}
	if (A<=24 && 24<=B){
		ans--;
	}
	if (A<=25 && 25<=B){
		ans--;
	}
	cout<<ans<<endl;
	return 0;
}