#include<iostream>
using namespace std;
int main(){
    int a,b;
    int c=3;
    cin>>a>>b;
    if(a<=23&&23<=b){
        c--;
    }
    if(a<=24&&24<=b){
        c--;
    }
    if(a<=25&&25<=b){
        c--;
    }
    cout<<c<<endl;
}