#include<bits/stdc++.h>
using namespace std;
long long n,m,i,j,a[300010],ans1,ans2;
int main(){
	cin>>n>>m;
	for(i=1;i<=n;i++){
		cin>>a[i];
	}
	for(i=0;i<=100;i++){
		for(j=1;j<=n;j++){
			if(i<=a[j]&&a[j]<(long long)(i+m)){
				ans1++;
			}
		}
		ans2=max(ans2,ans1);
		ans1=0;
	}
	cout<<ans2<<endl;
	return 0;
}