#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
int main() {
	int A, B;
	cin >> A >> B;
	int cnt = 0;
	for (int ia = 23; ia <= 25; ia++) {
		if (A <= ia && ia <= B) {
			cnt++;
		}
	}
	cout << 3-cnt << endl;
}