#include<bits/stdc++.h>
#define INF 6000010
using namespace std;
typedef long long LL;
int a[INF];
int cnt[INF];
int anocnt[INF];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    // freopen("in.txt","r",stdin);
    LL ans = 0;
    int n, k;
    cin >> n >> k;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        a[i] += 2000010;
        cnt[a[i]]++;
        ans = max(ans, (LL)cnt[a[i]]);
    }
    for (int i = 1; i <= n; i++)
    {
        anocnt[a[i]]--;
        if (anocnt[a[i]] < 0)
            anocnt[a[i]] = 0;
        anocnt[a[i] + k]++;
        ans = max(ans, (LL)anocnt[a[i] + k] + cnt[a[i] + k]);
    }
    cout << ans << endl;
}