#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=2000050;
const int mod=1000000;


int a[N]={0};
int vis[2*mod+5000]={0};
vector<int>v[N];//下标
vector<int>num;
int lower(int need,int x){
	int ans=-1;
	int l=0,r=v[need].size()-1;
	while(l<=r){
		int mid=(l+r)/2;
		if(v[need][mid]<x){
			l=mid+1;
			ans=mid;
		}else{
			r=mid-1;
		}
	}
	return ans;
}
int upper(int need,int x){
	int ans=v[need].size();
	int l=0,r=v[need].size()-1;
	while(l<=r){
		int mid=(l+r)/2;
		if(v[need][mid]>x){
			r=mid-1;
			ans=mid;
		}else{
			l=mid+1;
		}
	}
	return ans;
}
void solve(){
	int n,k;scanf("%d %d",&n,&k);
	for(int i=1;i<=n;i++){
		int x;
		scanf("%d",&x);
		a[i]=x+mod;
		num.push_back(x+mod);//出现过那些数字
		v[x+mod].push_back(i);
	}
	int ans=0;
	for(auto x:num){
		ans=max(ans,(int)v[x].size());
	}
	if(k==0){
		cout<<ans;
		return;
	}
	int now=-1;
	for(auto x:num){
		if(vis[x]==1) continue;
		int need=x-k;
		vis[x]=1;
		for(int i=0;i<v[x].size();i++){
			if(need<0||v[need].size()==0)continue;
			int aa=lower(need,v[x][i]);
			aa++;//前面有几个
			int bb=v[need].size()-aa;//后面有几个
			int c=upper(x,v[need][0]);
			int d=upper(x,v[need][v[need].size()-1]);
			ans=max(ans,aa+(int)v[x].size()-max((i-c),0));//改前面
			ans=max(ans,bb+(int)v[x].size()-max((d-i-1),0));//改后面
		}
	}
	printf("%d",ans);
	return ;
}


int main(){
	int t=1;
//	scanf("%d",&t);
	while(t--){
		solve();
		if(t) printf("\n");
	}
	return 0;
}