#include<iostream>
#include<vector>
#include<set>
#include<algorithm>
using namespace std;
class segtree1 {
private:
vector<int> st, lazy, a;
const int dv = 2e9;
const int ldv = 0;
int join(int l, int r) {
return min(l, r);
}
int ljoin(int l, int r) {
return l + r;
}
void upd(int s, int e, int node, int val) {
if (val == ldv) return;
st[node] += ((e - s + 1) * val);
}
int build(int s, int e, int node) {
if (s == e)
return st[node] = a[s];
int mid = (s + e) / 2;
return st[node] = join(build(s, mid, node * 2), build(mid + 1, e, node * 2 + 1));
}
void update(int s, int e, int node, int l, int r, int val) {
if ((l > e) || (r < s)) return;
if ((l <= s) && (r >= e)) {
upd(s, e, node, val);
lazy[node] = ljoin(lazy[node], val);
return;
}
int mid = (s + e) / 2;
upd(s, mid, node * 2, lazy[node]);
upd(mid + 1, e, node * 2 + 1, lazy[node]);
lazy[node * 2] = ljoin(lazy[node * 2], lazy[node]);
lazy[node * 2 + 1] = ljoin(lazy[node * 2 + 1], lazy[node]);
lazy[node] = ldv;
update(s, mid, node * 2, l, r, val);
update(mid + 1, e, node * 2 + 1, l, r, val);
st[node] = join(st[node * 2], st[node * 2 + 1]);
}
int query(int s, int e, int node, int l, int r) {
if ((l > e) || (r < s)) return dv;
if ((l <= s) && (r >= e)) return st[node];
int mid = (s + e) / 2;
upd(s, mid, node * 2, lazy[node]);
upd(mid + 1, e, node * 2 + 1, lazy[node]);
lazy[node * 2] = ljoin(lazy[node * 2], lazy[node]);
lazy[node * 2 + 1] = ljoin(lazy[node * 2 + 1], lazy[node]);
lazy[node] = ldv;
return join(query(s, mid, node * 2, l, r),
query(mid + 1, e, node * 2 + 1, l, r));
}
public:
segtree1(int n, vector<int> arr) {
a = arr;
st.resize(4 * n, dv);
lazy.resize(4 * n, ldv);
build(0, n - 1, 1);
}
int query(int l, int r) {
return query(0, a.size() - 1, 1, l, r);
}
void update(int l, int r, int val) {
update(0, a.size() - 1, 1, l, r, val);
}
};
class segtree2 {
private:
vector<int> st, lazy, a;
const int dv = 0;
const int ldv = 0;
int join(int l, int r) {
return max(l, r);
}
int ljoin(int l, int r) {
return l + r;
}
void upd(int s, int e, int node, int val) {
if (val == ldv) return;
st[node] = ((e - s + 1) * val);
}
int build(int s, int e, int node) {
if (s == e)
return st[node] = a[s];
int mid = (s + e) / 2;
return st[node] = join(build(s, mid, node * 2), build(mid + 1, e, node * 2 + 1));
}
void update(int s, int e, int node, int l, int r, int val) {
if ((l > e) || (r < s)) return;
if ((l <= s) && (r >= e)) {
upd(s, e, node, val);
lazy[node] = ljoin(lazy[node], val);
return;
}
int mid = (s + e) / 2;
upd(s, mid, node * 2, lazy[node]);
upd(mid + 1, e, node * 2 + 1, lazy[node]);
lazy[node * 2] = ljoin(lazy[node * 2], lazy[node]);
lazy[node * 2 + 1] = ljoin(lazy[node * 2 + 1], lazy[node]);
lazy[node] = ldv;
update(s, mid, node * 2, l, r, val);
update(mid + 1, e, node * 2 + 1, l, r, val);
st[node] = join(st[node * 2], st[node * 2 + 1]);
}
int query(int s, int e, int node, int l, int r) {
if ((l > e) || (r < s)) return dv;
if ((l <= s) && (r >= e)) return st[node];
int mid = (s + e) / 2;
upd(s, mid, node * 2, lazy[node]);
upd(mid + 1, e, node * 2 + 1, lazy[node]);
lazy[node * 2] = ljoin(lazy[node * 2], lazy[node]);
lazy[node * 2 + 1] = ljoin(lazy[node * 2 + 1], lazy[node]);
lazy[node] = ldv;
return join(query(s, mid, node * 2, l, r),
query(mid + 1, e, node * 2 + 1, l, r));
}
public:
segtree2(int n, vector<int> arr) {
a = arr;
st.resize(4 * n, dv);
lazy.resize(4 * n, ldv);
build(0, n - 1, 1);
}
int query(int l, int r) {
return query(0, a.size() - 1, 1, l, r);
}
void update(int l, int r, int val) {
update(0, a.size() - 1, 1, l, r, val);
}
};
int main() {
ios_base::sync_with_stdio(false); cin.tie(NULL);
int n, d, ans = 0; cin >> n >> d;
vector<int> a(n);
for (auto& x : a) cin >> x;
vector<pair<int, int>> arr;
vector<int> ld(n, n - 1);
segtree1 st1(n, a);
for (int i = n - 1; i >= (d - 1); --i)
arr.push_back({ st1.query(i - d + 1, i), i });
sort(arr.begin(), arr.end());
vector<pair<int, int>> sa(n);
set<int> s;
for (int i = 0; i < n; ++i) sa[i] = { a[i], i };
sort(sa.begin(), sa.end());
int j = n - 1;
for (int i = n - 1; i >= 0; --i) {
while ((j >= 0) && (arr[j].first > sa[i].first))
s.insert(arr[j].second), j--;
auto it = s.lower_bound(sa[i].second + 1);
if (it != s.end()) ld[sa[i].second] = *it;
}
vector<int> dp(n, -1e9);
segtree2 st2(n, dp);
vector<pair<int, vector<int>>> v;
for (int i = 0; i < n; ++i)
if ((i == 0) || (sa[i - 1].first < sa[i].first))
v.push_back({ sa[i].first, {sa[i].second} });
int m = v.size();
for (int i = m - 1; i >= 0; --i) {
for (auto x : v[i].second)
dp[x] = max(1, st2.query(x + 1, ld[x]) + 1);
for (auto x : v[i].second)
st2.update(x, x, dp[x]);
}
for (auto x : dp) ans = max(ans, x);
cout << ans;
}
