#include "bits/stdc++.h"
using namespace std;
#define ll long long int

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int a,b,c=0;
    cin >> a>>b;
    if (a<=23&&23<=b) c++;
    if (a<=24&&24<=b) c++;
    if (a<=25&&25<=b) c++;
    cout << 3-c << endl;
    return 0;
}