#include <bits/stdc++.h>
using namespace std;

int main () {
  int l,r;
  cin >> l >> r;
  
  vector<int> border = {1, 295, 296, 416, 417, 420};
  
  int l_idx = lower_bound(border.begin(), border.end(), l) - border.begin();
  int r_idx = lower_bound(border.begin(), border.end(), r) - border.begin();
  
  cout << r_idx / 2 - l_idx / 2 << endl;
}