#include<bits/stdc++.h>
#define int long long
#define ss second
#define ff first
#define pb push_back
using namespace std;
const int mxn=2e5+4;
const int inf=1e12;
int n,m;
int a[mxn],dp[mxn];
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n>>m;
for(int i=0; i<n; i++) {
cin>>a[i];
a[i]=(i+1)*m-a[i];
}
dp[0]=-inf;
for(int i=1; i<=n; i++) {
dp[i]=inf;
}
for(int i=0; i<n; i++){
if(a[i]<0) continue;
int j=upper_bound(dp,dp+n+1,a[i])-dp;
if(dp[j-1]<=a[i]) dp[j]=min(dp[j],a[i]);
}
int k=0;
for(int i=1; i<=n; i++) {
if(dp[i]<inf) k=i;
}
cout<<n-k;
}
