#include <bits/stdc++.h>
#include <atcoder/all>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int l, r;
    cin >> l >> r;
    vector<int> vs;
    for(int i=l;i<=r;i++) {
        if(i<=295) vs.push_back(1);
        else if(i<=416) vs.push_back(2);
        else vs.push_back(3);
    }
    vs.erase(unique(vs.begin(),vs.end()),vs.end());
    cout << vs.size() -1 << endl;
    return 0;
}