#include <bits/stdc++.h>
#define all(a) a.begin(), a.end()
#define popcount(x) __builtin_popcountll(x)
using namespace std;
using namespace chrono;
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
// freopen("cowjog.in", "r", stdin);
// freopen("cowjog.out", "w", stdout);
int n,m; cin >> n >> m;
vector<int> lis;
for (int i = 1; i <= n; i++) {
int a; cin >> a;
a = i*m - a;
if (a < 0) continue;
auto it = lower_bound(all(lis), a);
if (it == lis.end()) lis.push_back(a);
else *it = a;
}
cout << n - lis.size();
}
