#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ordered_set <int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
#define ordered_multiset <int, null_type, less_equal <int>, rb_tree_tag, tree_order_statistics_node_update>
#define int long long
#define double long double
#define pii pair <int, int>
#define tiii tuple <int, int, int>
#define tiiii tuple <int, int, int, int>
#define emb emplace_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define iShowSpeed cin.tie(NULL)->sync_with_stdio(false)
#define matrix vector <vector <int>>
#define mat(n, m) vector <vector <int>> (n, vector <int> (m));
const int mod = 1e9 + 7;
const int inf = 1e18;
const matrix II = {{1, 0}, {0, 1}};
const int N = 2e5 + 5;
void solve(){
int n, k; cin >> n >> k;
vector <int> a(n + 1); for (int i = 1; i <= n; i++) cin >> a[i];
vector <int> lis;
for (int i = 1; i <= n; i++) {
if (a[i] > i * k) continue;
int val = -(a[i] - k * i);
int idx = upper_bound(all(lis), val) - lis.begin();
if (lis.empty() || idx == lis.size()) lis.emb(val);
else lis[idx] = val;
}
cout << n - lis.size();
}
int32_t main(){
iShowSpeed;
// int q; cin >> q; while (q--)
solve();
}
