void gen_primelist(vector<int>& out, ll high) {
    out.resize(high + 1);
    out[0] = out[1] = 1;
    for (ll i = 2; i <= high; i++) {
        if (out[i] == 0) {
            for (ll j = i; j <= high; j += i) { // i*i
                out[j] += 1;
            }
        }
    }
}


{
    ll N,K;rd(N,K);
    vector<int> p;
    gen_primelist(p,N);
    ll cnt=0;
    REP(i,2,N+1) cnt+=p[i]>=K;
    wt(cnt);
}