#include <bits/stdc++.h>
using namespace std;
// Shortcuts for common operations
#define pb push_back
#define ppb pop_back
#define f first
#define s second
#define all(x) (x).begin(), (x).end()
#define ll long long
#define endl "\n"
// Type definitions for convenience
typedef vector<int> vi;
typedef vector<bool> vb;
typedef pair<int, int> pii;
typedef vector<vi> vvi;
typedef vector<pii> vii;
typedef unordered_set<int> usi;
typedef unordered_map<int, int> umii;
// Debugging macros
#define debug(x) cerr << #x << " = " << (x) << '\n'
#define debug_vector(v) _debug_vector(#v, v)
template<typename T>
void _debug_vector(const string& name, const vector<T>& a) {
cerr << name << " = [ ";
for(const auto &x : a) cerr << x << ' ';
cerr << "]\n";
}
// I/O redirection for local testing
#define iofile(io) \
freopen((io + ".in").c_str(), "r", stdin); \
freopen((io + ".out").c_str(), "w", stdout);
// delta for floodfill
vi dx = {0, 1, 0, -1};
vi dy = {1, 0, -1, 0};
// extended deltas for floodfill
vi edx = {0, 1, 0, -1, 1, 1, -1, -1};
vi edy = {1, 0, -1, 0, 1, -1, 1, -1};
// Common outputs
void yes() { cout << "YES" << '\n'; }
void no() { cout << "NO" << '\n'; }
// cin.tie(0)->sync_with_stdio(0);
void fx() {
// Functionality for fx
int n, k;
cin >> n >> k;
vector<ll>b(n, 0);
int offset = k;
for(auto &i: b){
cin >> i;
i = offset - i;
offset += k;
}
vector<ll>lis;
for(auto &i: b){
if(i < 0) continue;
if(upper_bound(all(lis), i) == lis.end()) lis.pb(i);
else *upper_bound(all(lis), i) = i;
}
cout << (n - lis.size()) << endl;
}
int main() {
// Uncomment the following lines for file I/O
// iofile(string("hello"));
// Uncomment the following lines for multiple test cases
// int t; cin >> t;
// while(t--) fx();
// Single test case
fx();
return 0;
}
