#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <random>
using namespace std;
#define Would
#define you

int main() {
	int a, b, ans = 0;
	cin >> a >> b;
	for (int i = 23; i <= 25; ++i) {
		if (a <= i && i <= b) { ++ans; }
	}
	cout << 3 - ans << endl;
}