#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, m;
cin >> n >> m;
vector<int64_t> a(n);
for (int i = 0; i < n; i++) {
int x;
cin >> x;
a[i] = int64_t(i + 1) * m - x;
}
vector<int64_t> best(n, LLONG_MAX);
int ans = 0;
for (int i = 0; i < n; i++) {
if (a[i] >= 0) {
int j = upper_bound(best.begin(), best.end(), a[i]) - best.begin();
best[j] = min(best[j], a[i]);
ans = max(ans, j + 1);
}
}
cout << n - ans << '\n';
return 0;
}
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