#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) begin(x),end(x)
#define sz(x) (int)x.size()
#define ul unsigned long long
int gcd(int a,int b) {return b == 0 ? a:gcd(b,a%b);}
int main() {
cin.tie(0)->sync_with_stdio(0);
ll n,m;cin >> n >> m;
vector<ll> a(n);
for(int i=0;i<n;i++){
cin >> a[i];
a[i] = (ll)(i + 1) * m - a[i];
}
vector<ll> lis;
for(int i=0;i<n;i++){
if(a[i] < 0) continue;
int p = upper_bound(all(lis),a[i]) - lis.begin();
if(p == sz(lis)){
lis.push_back(a[i]);
}
else lis[p] = a[i];
}
cout << n - sz(lis);
return 0;
}
