#include <bits/stdc++.h>

using namespace std;

using vi = vector<int>;


int main() {
    int n, k;
    cin >> n >> k;
    vi a(n + 1);
    map<int, vi> cnt;
    for (int i = 1; i <= n; i++)
        cin >> a[i], cnt[a[i]].push_back(i);

    auto lst = [&cnt](int x, int i) {
//        cout << x << " " << i << " : " ;
//        for( auto j : cnt[x] ) cout << j << " ";
//        cout << "\n";

        if (cnt[x].empty()) return 0;
        auto it = lower_bound(cnt[x].begin(), cnt[x].end(), i);
        if( it == cnt[x].end() ) return cnt[x].back();
        if (*it < i) return *it;
        if (it == cnt[x].begin()) return 0;
        return *prev(it);
    };

    vi pre(n + 1);
    for (int i = 1; i <= n; i++)
        pre[i] = pre[lst(a[i], i)] + 1;

    vi suf(n + 1);
    for (int i = n, j; i >= 1; i--) {
        suf[i]++, j = lst(a[i], i);
        if (j != 0) suf[j] += suf[i];
    }
//    for (int i = 1; i <= n; i++)
//        cout << pre[i] << " ";
//    cout << "\n";
//    for (int i = 1; i <= n; i++)
//        cout << suf[i] << " ";
//    cout << "\n";

    vi f(n + 1);
    for (int i = 1, j; i <= n; i++) {
        f[i] = pre[i], j = lst(a[i] - k, i);
//        cout << " " << i << " " << a[i] << " " << a[i] - k << " " << j << "\n";
        if (j != 0) f[i] -= pre[j];
    }
//    for (int i = 1; i <= n; i++)
//        cout << f[i] << " ";
//    cout << "\n";


    vi g(n + 1);
    for (int i = 1; i <= n; i++)
        g[i] = max(f[i], g[lst(a[i], i)]);
    for (int i = n, j; i >= 1; i--) {
        j = lst(a[i] + k, i);
        g[i] = pre[i];
        if (j > 0) g[i] += g[j];
    }
    int res = 0;
    for (int i = 1, j, t; i <= n; i++) {
        j = lst(a[i] - k, i), t = suf[i];
        if (j > 1) t += g[j];
        res = max(res, t);
    }
    cout << res << "\n";
    return 0;
}