#include <iostream>
using namespace std;
int main(void) {
	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;
}