#include<bits/stdc++.h>
using namespace std;
const int MAX_N = 200005;
int a[MAX_N],b[MAX_N],n,m;
vector<int> dp;
int main()
{
cin >> n >> m;
for(int i = 1;i <= n;i++)
{
cin >> a[i];
b[i] = m*i-a[i];
}
for(int i = 1;i <= n;i++)
{
if(b[i] < 0) continue;
auto it = upper_bound(dp.begin(),dp.end(),b[i]);
int x = it-dp.begin();
if(x == dp.size()) dp.push_back(b[i]);
else dp[x] = b[i];
}
cout << n-dp.size() << '\n';
return 0;
}
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