// source problem :
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define int long long
#define lb lower_bound
#define ub upper_bound
#define MASK(i) (1LL << (i))
void ckmax(int& f, int s)
{
f = (f > s ? f : s);
}
void ckmin(int& f, int s)
{
f = (f < s ? f : s);
}
int32_t main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
int n, m;
cin >> n >> m;
vector<int> a(n + 1);
for (int i = 1; i <= n; i++)
{
cin >> a[i];
a[i] -= i * m;
if (a[i] <= 0) a[i] = -a[i];
else a[i] = -1;
}
set<pair<int, int>> st;
for (int i = 1; i <= n; i++)
{
if (a[i] < 0) continue;
auto it = st.lb(make_pair(a[i], i));
if (it != st.end()) st.erase(it);
st.insert({a[i], i});
}
cout << n - st.size();
return 0;
}
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