#include <bits/stdc++.h>
#define int long long
using namespace std;
const long long N = 2e5 + 5;
int a[N];
multiset<int> st;
int n, m, d;
void solve()
{
cin >> n >> m;
for (int i = 1; i <= n; i++)
{
cin >> a[i];
}
for (int i = 1; i <= n; i++)
{
if (a[i] > i * m)
continue;
d = i * m - a[i];
auto k = st.upper_bound(d);
if (k != st.end())
{
st.extract(*k);
}
st.insert(d);
}
cout << n - st.size();
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
int t = 1;
// cin >> t;
for (int i = 1; i <= t; i++)
{
// cout << "Case #" << i << ':' << ' ';
solve();
cout << endl;
}
return 0;
}
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