#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
	cin.tie(0)->sync_with_stdio(0);
	int n, m;
	cin >> n >> m;
	vector<int> v, b;
	for(int i = 1; i <= n; i++) {
		int x;
		cin >> x;
		if(x <= m * i) b.push_back(m * i - x);
	}
	for(auto x : b) {
		auto it = upper_bound(v.begin(), v.end(), x);
		if(it == v.end()) v.push_back(x);
		else *it = x;
	}
	cout << n - v.size();
	return 0;
}
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