#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define f first
#define s second
#define chmin(a, b) a = min(a,b)
#define chmax(a, b) a = max(a,b)
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define all(x) x.begin(),x.end()
#define v vector
int main() {
ios::sync_with_stdio(false); cin.tie(0);
ll n, m; cin >> n >> m;
v<ll> dp;
F0R(i,n) {
ll a; cin >> a;
ll val = m*(i+1)-a;
if (val>=0) {
int pos = upper_bound(all(dp),val)-dp.begin();
if (pos==dp.size()) {dp.pb(val);}
else {dp[pos] = val;}
}
} cout << n-dp.size() << '\n';
}
