#include <bits/stdc++.h>

#include <atcoder/all>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define FAST_IO                \
  ios::sync_with_stdio(false); \
  cin.tie(0);
const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

int main() {
  FAST_IO

  int L, R;
  cin >> L >> R;
  int ans = 0;
  for (int i = L + 1; i <= R; i++) {
    if (i == 1) ans ++;
    if (i == 296) ans ++;
    if (i == 417) ans ++;
  }
  cout << ans << endl;
}