import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.ArrayList;
public class triusis { // any other name breaks the grader lmao
public static void main(String[] args) throws IOException {
BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(read.readLine());
int N = Integer.parseInt(st.nextToken());
int M = Integer.parseInt(st.nextToken());
ArrayList<Integer> unch = new ArrayList<>();
for (int i = 0; i < N; i++) {
int x = Integer.parseInt(read.readLine());
if ((i + 1) * M >= x) {
unch.add((i + 1) * M - x);
}
}
System.out.println(N - NDS(unch));
}
private static int NDS(ArrayList<Integer> arr) {
ArrayList<Integer> minEndings = new ArrayList<>();
for (int i : arr) {
int pos = upper_bound(minEndings, i);
if (pos == minEndings.size()) {
minEndings.add(i);
} else {
minEndings.set(pos, i);
}
}
return minEndings.size();
}
public static int upper_bound(ArrayList<Integer> arr, int key) {
int len = arr.size();
int lo = 0;
int hi = len-1;
int mid = (lo + hi)/2;
while (true) {
int cmp = arr.get(mid).compareTo( key);
if (cmp == 0 || cmp < 0) {
lo = mid+1;
if (hi < lo)
return mid<len-1?mid+1:-1;
} else {
hi = mid-1;
if (hi < lo)
return mid;
}
mid = (lo + hi)/2;
}
}
}
