#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
using namespace std;
#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, k;
cin>>n>>k;
vector<int> vect(n), dp(n, 0), f(n);
for (int i=0; i<n; ++i)cin>>vect[i], f[i]=vect[i];
sort(f.begin(), f.end());
for (int i=0; i<n; ++i)vect[i]=(lower_bound(f.begin(), f.end(), vect[i])-f.begin())/k;
for (int i=0; i<n; ++i){
dp[i]=1;
for (int j=0; j<i; ++j)if (vect[j]<=vect[i])dp[i]=max(dp[i], dp[j]+1);
}
cout<<n-*max_element(dp.begin(), dp.end());
}
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