#include <bits/stdc++.h>
#define int long long
#define ll long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<char,char> pcc;
typedef pair<int,pii> ipii;
typedef pair<pii,pii> ipiii;
const int MAXN = 3e5+10;
const int SQRT = 610;
const int MAXA = 50;
const int MOD = 1e6+7;
const int INF = 1e18+10;
const int LOG = 30;
int n, d, a[MAXN];
vector <pii> vec, vec2;
int ANS, dp[MAXN], tag[MAXN], las[MAXN];
struct seg {
int st[4*MAXN];
int que(int id, int l, int r, int x, int y){
if(x<=l && r<=y) return st[id];
if(r<x || y<l) return 0;
return max(que(lf,l,md,x,y), que(rg,md+1,r,x,y));
}
int upd(int id, int l, int r, int x, int p){
if(l==r && l==x) return st[id] = p;
if(r<x || x<l)return st[id];
return st[id] = max(upd(lf,l,md,x,p),upd(rg,md+1,r,x,p));
}
} A;
signed main(){
// ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin>>n>>d;
for(int i=1; i<=n; i++){
cin>>a[i]; vec.pb({a[i],i});
vec2.pb({a[i],-i});
}
sort(vec2.rbegin(), vec2.rend());
for(auto [x, id] : vec2){
id = -id;
tag[id] = 1;
int tot = 0;
for(int j=id-1; j>=1; j--){
las[id] = j;
if(tag[j]) tot++;
else tot = 0;
if(tot == d) break;
}
// cout << id << ' ' << las[id] << " las\n";
}
sort(vec2.begin(), vec2.end());
for(auto [x, id] : vec2){
id = -id;
dp[id] = A.que(1,1,n,las[id],id)+1; A.upd(1,1,n,id,dp[id]);
ANS = max(ANS, dp[id]);
}
cout << ANS << '\n';
}
