#include<bits/stdc++.h>
using namespace std;
const int maxn=1e6+10;
int n,k,a[maxn],res;
vector<int> pos[maxn*2];
void solve(){
	cin>>n>>k,res=0;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		pos[a[i]+1000000].push_back(i);
	}
	for(int i=0;i<=2e6;i++) res=max(res,(int)pos[i].size());
	if(k==0) return (void)(cout<<res<<endl);
	for(int i=0;i<=2e6;i++){
		int j=i+k,z=0;
		if(j<0||j>2e6) continue;
		int sz1=pos[i].size(),sz2=pos[j].size(),now=sz2;
		if(!sz1||!sz2) continue;
		if(z<sz2) while(z<sz2&&pos[j][z]<pos[i][0]) z++;
//		cout<<z<<" "<<pos[j][z]<<" "<<pos[i][0]<<" "<<i-1e6<<" "<<j-1e6<<endl; 
		for(int x=0;x<sz1;x++){
			if(z<sz2) while(z<sz2&&pos[j][z]<pos[i][x]) z++,now--;
			res=max(res,now+x+1);
//			cout<<now<<" "<<x<<endl;
		}
	}
	cout<<res<<endl;
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	int t=1;
	while(t--) solve();
	return 0;
}
/*
5 1000000
1000000 1000000 3 1000000 1000000
*/