#include <bits/stdc++.h>
#define all(vec) vec.begin(),vec.end()
using namespace std;
using ll=long long;
using P=pair<int,int>;
const ll INF=1LL<<30;
const ll LINF=1LL<<61;
const double eps=1e-9;
const ll MOD=1000000007LL;
int main(){
    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;
}