#include<bits/stdc++.h>
using namespace std;
//#define int long long
#define fer(i,a,b) for(int i=a;i<=b;i++)
#define fdr(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back 
#define xx first
#define yy second
const int N=4e6+10; 
const int INF=1e9+10;

int n,k;
int a[N];
vector<int> v[N];

signed main(){
	ios::sync_with_stdio(0);cin.tie(0),cout.tie(0);
	cin>>n>>k;
	map<int,int> mp; 
	fer(i,1,n){
		cin>>a[i];
		a[i]+=N/2;
		mp[a[i]]++;
		v[a[i]].pb(a[i]);
		v[a[i]+k].pb(a[i]);
	}
	int ans=0;
	for(auto it:mp){
		int nx=it.xx;
		int ny=it.yy;
		int cnt=0;
		int mx=0;
		for(int i:v[nx]){
			if(i==nx-k){
				cnt++;
				mx=max(mx,cnt);	
			}
			else{
				cnt--;
				if(cnt<0) cnt=0;
			}
		}
		ans=max(ans,ny+mx);
	}	
	cout<<ans<<endl;
}


//5
//4
//1 -3 2 -4
//11
//91 66 73 71 32 83 72 79 84 33 93
//12
//91 66 73 71 32 83 72 79 84 33 33 93
//13
//91 66 73 71 32 83 72 79 84 33 33 33 93
//1
//0