//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;
template <class T>
V<T> make_vec(size_t a) {
    return V<T>(a);
}
template <class T, class... Ts>
auto make_vec(size_t a, Ts... ts) {
    return V<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define per(i, b) per2(i, 0, b)
#define per2(i, a, b) for (int i = int(b) - 1; i >= int(a); i--)
#define ALL(c) (c).begin(), (c).end()
#define SZ(x) ((int)(x).size())

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }

template <class T, class U>
void chmin(T& t, const U& u) {
    if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
    if (t < u) t = u;
}

template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << "," << p.second << ")";
    return os;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "{";
    rep(i, v.size()) {
        if (i) os << ",";
        os << v[i];
    }
    os << "}";
    return os;
}

#ifdef LOCAL
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << H;
    debug_out(T...);
}
#define debug(...) \
    cerr << __LINE__ << " [" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif

// https://cp-algorithms.com/algebra/prime-sieve-linear.html

const int maxv = 1000010;
// lowest prime factor
int lp[maxv];
bool pri[maxv];
vector<int> pr;

void linear_sieve() {
    for (int i = 2; i < maxv; ++i) pri[i] = true;
    for (int i = 2; i < maxv; ++i) {
        if (pri[i]) {
            lp[i] = i;
            pr.pb(i);
        }
        for (int j = 0;
             j < (int)pr.size() && pr[j] <= lp[i] && i * pr[j] < maxv; ++j) {
            pri[i * pr[j]] = false;
            lp[i * pr[j]] = pr[j];
            if (i % pr[j] == 0) break;
        }
    }
}

constexpr ll floor_sqrt(ll n) {
    if (n == 0) return 0;
    return llround(floor(sqrt(n)));
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll L, R;
    cin >> L >> R;

    linear_sieve();

    V<ll> f(R - L + 1);
    V<int> ng(R - L + 1);
    for (ll i = L; i <= R; ++i) {
        f[i - L] = i;
    }

    for (auto p : pr) {
        ll l = (L + p - 1) / p * p;
        for (ll i = l; i <= R; i += p) {
            ll& x = f[i - L];
            x /= p;

            while (x % p == 0) {
                x /= p;
                ng[i - L] = 1;
            }
        }
    }

    int ans = 0;
    for (ll i = L; i <= R; ++i) {
        if (ng[i - L]) continue;
        ll x = floor_sqrt(f[i - L]);
        if (x == 1 || x * x != f[i - L]) {
            // debug(i);
            ans++;
        }
    }
    cout << ans << endl;

    return 0;
}