#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
int main(){
    ll a,b;
    cin >> a >> b;
    ll res = 3;
    if(23>=a && 23<=b)res--;
    if(24>=a && 24<=b)res--;
    if(25>=a && 25<=b)res--;
    cout << res << endl;
}