#include <bits/stdc++.h>
using namespace std;
typedef pair<long long, long long> Point;
#define ll long long
#define ff first
#define ss second
#define pb push_back
#define mk make_pair
#define IOS ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define MOD 1000000007
#define MOD1 1000000009
#define sqr(x) sqr((x)*(x))
void debug_out() { cerr << endl; }
template<typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << ' ' << H; debug_out(T...); }
#ifdef BE_DEBUG
#define debug(...) cerr << "\033[1;31m(" << #__VA_ARGS__ << "):\033[0m", debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif
const int N = 200005;
int n,m;
int a[N];
multiset<int> s;
multiset<int> :: iterator it;
int main() {
IOS
// freopen("cownomics.in", "r", stdin);
// freopen("cownomics.out", "w", stdout);
cin >> n >> m;
for(int i = 1; i <= n; i ++) {
cin >> a[i];
}
for(ll i = 1; i <= n; i ++) {
if(a[i] > m * i) continue;
int tmp = m * i - a[i];
it = s.upper_bound(tmp);
if(it != s.end())
s.erase(it);
s.insert(tmp);
}
cout << n - s.size();
}
