#include <bits/stdc++.h>
#ifdef LOCAL_DEBUG
#include "debug.h"
#else
#define dbg(...) (void)0
#endif
using u32 = unsigned int;
using i64 = long long;

namespace skadi {

void solve() {
    int n, k;
    std::cin >> n >> k;
    std::vector<int> a(n);
    std::vector<std::vector<int>> p(5e6);
    for (int i = 0; i < n; i++) {
        std::cin >> a[i];
        a[i] += 1e6;
        p[a[i]].push_back(-1);
        p[a[i] + k].push_back(1);
    }
    int ans = 0;
    for (auto& v : p) {
        if (v.empty()) {
            continue;
        }
        int pre = 0, min = 0, s = 0;
        for (int x : v) {
            pre += x;
            min = std::min(min, pre);
            s = std::max(s, pre - min);
        }
        ans = std::max(ans, s + (int)std::count(v.begin(), v.end(), -1));
    }
    std::cout << ans << '\n';
}

} // namespace skadi

int main() {
#ifndef LOCAL_DEBUG
    std::cin.tie(nullptr)->sync_with_stdio(false);
#endif
    int t = 1;
    // std::cin >> t;
    while (t--) {
        skadi::solve();
    }
    return 0;
}