#include <bits/stdc++.h>
#define r(i,n) for(int i = 0; i<n; i++)
using namespace std;

int main(){
  int a, b, count=3;
  cin >> a >> b;
  if(a<=23&&23<=b)count--;
  if(a<=24&&24<=b)count--;
  if(a<=25&&25<=b)count--;
  cout << count ;
}