#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(nullptr);
int n, k;
cin >> n >> k;
vector<int> a(n), ap(n), b(n);
for (int i = 0; i < n; ++i) {
cin >> a[i];
ap[i] = a[i];
}
sort(ap.begin(), ap.end());
for (int i = 0; i < n; ++i) {
b[i] = (lower_bound(ap.begin(), ap.end(), a[i]) - ap.begin()) / k;
}
int ans = 0;
vector<int> c;
for (int i = 0; i < n; ++i) {
int it = upper_bound(c.begin(), c.end(), a[i]) - c.begin();
if (it == c.size()) c.push_back(a[i]);
}
cout << n - (int)c.size() << "\n";
return 0;
}
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