#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define sort undefined_function // To use stable_sort instead sort
#define bpc __builtin_popcount
#define ull unsigned long long
#define ld double
#define ll long long
#define mp make_pair
#define F first
#define S second
#pragma GCC optimize("O3")
using namespace __gnu_pbds;
using namespace std;
typedef tree<long long, null_type, less_equal<long long>,
rb_tree_tag, tree_order_statistics_node_update> Tree;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll INF = 9223372036854775807LL;
const ll inf = 2147483647;
const ll MOD = 998244353; //[998244353, 1e9 + 7, 1e9 + 13]
const ld PI = acos(-1);
const ll NROOT = 300;
ll binpow(ll a, ll b, ll _MOD = -1) {
if (_MOD == -1)
_MOD = MOD;
ll res = 1;
for (; b; b /= 2, a *= a, a %= _MOD)
if (b & 1) res *= a, res %= _MOD;
return res;
}
void set_IO(string s) {
#ifndef LOCAL
string in = s + ".in";
string out = s + ".out";
freopen(in.c_str(), "r", stdin);
freopen(out.c_str(), "w", stdout);
#endif
}
bool dataOverflow(ll a, ll b) {return (log10(a) + log10(b) >= 18);}
ll gcd(ll a, ll b) {return b ? gcd(b, a % b) : a;}
ll lcm(ll a, ll b) {return a * b / gcd(a, b);}
ll ceil(ll a, ll b) {return (a + b - 1) / b;}
class ST{
private:
int n;
vector<ll> st;
void update(int nod, int l, int r, int pos, ll val) {
if (l == r) {
st[nod] += val;
return;
}
int mid = (l + r) >> 1;
if (pos <= mid)
update(nod << 1, l, mid, pos, val);
else
update((nod << 1) | 1, mid + 1, r, pos, val);
st[nod] = max(st[nod << 1], st[(nod << 1) | 1]);
}
ll query(int nod, int l, int r, int L, int R) {
if (r < L || R < l)
return 0;
if (L <= l && r <= R)
return st[nod];
int mid = (l + r) >> 1;
ll q1 = query(nod << 1, l, mid, L, R);
ll q2 = query((nod << 1) | 1, mid + 1, r, L, R);
return max(q1, q2);
}
public:
ST(int _n) {
n = _n;
st.resize(4 * n);
}
void update(int pos, ll val) {
update(1, 1, n, pos, val);
}
ll query(int L, int R) {
if (R < L) return 0;
return query(1, 1, n, L, R);
}
};
int n, d;
vector<int> v;
vector<vector<ll>> memo;
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> d;
set<int> s;
v.resize(n + 1);
memo.resize(n + 1, vector<ll> (n + 10, -1));
for (int i = 1; i <= n; i ++) {
cin >> v[i];
s.insert(v[i]);
}
int index = 0;
map<int, int> ID;
for (auto &x : s)
ID[x] = ++index;
vector<pair<int, int>> aux;
for (int i = 1; i <= n; i ++) {
v[i] = ID[v[i]];
aux.push_back({v[i], i});
}
stable_sort(aux.begin(), aux.end());
ST ans(n + 1);
ll res = 0;
int last = -1;
vector<int> buff;
for (auto &[x, i] : aux) {
if (last != x) {
last = x;
for (auto pos : buff)
ans.update(pos, 1);
buff.clear();
}
ll tmp = ans.query(max(1, i - d), i) + 1;
res = max(res, tmp);
ans.update(i, tmp - 1);
buff.push_back(i);
}
cout << res << '\n';
return 0;
}
