#include<bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pb push_back
signed main()
{
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
// freopen("input.000","r",stdin);
// freopen("output.000","w",stdout);
// srand((unsigned)time(NULL));
// rand()
int n,d,i,a[7005],dp[7005][7005],ans,j,k,u,min_dist,c;
cin>>n>>d;
for (i=1;i<n+1;i++) cin>>a[i];
for (i=1;i<n+1;i++) dp[i][0]=1;
for (i=2;i<n+1;i++) for (j=1;j<i;j++)
{
c=0;min_dist=0;
for (k=j+1;k<i;k++) if (a[k]>a[j])
{
c++;
min_dist=max(min_dist,c);
}
else c=0;
if (min_dist<d)
{
for (k=1;k<d+1;k++)
if (i-k>j)
{
if (a[j]>=a[i-k]) dp[i][j]=max(dp[i][j],dp[i-k][j]);
}
else if (i-k==j)
{
for (u=0;u<j;u++) if (a[u]<a[j]) dp[i][j]=max(dp[i][j],dp[j][u]);
}
if (a[i]>a[j]) dp[i][j]++;
}
else dp[i][j]=-1;
}
// for (i=1;i<n+1;i++)
// {
// for (j=0;j<i;j++) cout<<dp[i][j]<<" ";
// cout<<"\n";
// }
ans=dp[n][0];
for (j=1;j<n;j++) ans=max(ans,dp[n][j]);
cout<<ans;
}
