#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);
    }
    i64 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 + 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;
}

answer.code: In function ‘void skadi::solve()’:
answer.code:34:23: error: no matching function for call to ‘max(i64&, std::__iterator_traits<__gnu_cxx::__normal_iterator<int*, std::vector<int> >, void>::difference_type)’
   34 |         ans = std::max(ans, s + std::count(v.begin(), v.end(), -1));
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51,
                 from answer.code:1:
/usr/include/c++/13/bits/stl_algobase.h:257:5: note: candidate: ‘template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)’
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/13/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
answer.code:34:23: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘std::__iterator_traits<__gnu_cxx::__normal_iterator<int*, std::vector<int> >, void>::difference_type’ {aka ‘long int’})
   34 |         ans = std::max(ans, s + std::count(v.begin(), v.end(), -1));
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_algobase.h:303:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)’
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/13/bits/stl_algobase.h:303:5: note:   template argument deduction/substitution failed:
answer.code:34:23: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘std::__iterator_traits<__gnu_cxx::__normal_iterator<int*, std::vector<int> >, void>::difference_type’ {aka ‘long int’})
   34 |         ans = std::max(ans, s + std::count(v.begin(), v.end(), -1));
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/algorithm:61:
/usr/include/c++/13/bits/stl_algo.h:5795:5: note: candidate: ‘template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)’
 5795 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/13/bits/stl_algo.h:5795:5: note:   template argument deduction/substitution failed:
answer.code:34:23: note:   mismatched types ‘std::initializer_list<_Tp>’ and ‘long long int’
   34 |         ans = std::max(ans, s + std::count(v.begin(), v.end(), -1));
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/stl_algo.h:5805:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)’
 5805 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/13/bits/stl_algo.h:5805:5: note:   template argument deduction/substitution failed:
answer.code:34:23: note:   mismatched types ‘std::initializer_list<_Tp>’ and ‘long long int’
   34 |         ans = std::max(ans, s + std::count(v.begin(), v.end(), -1));
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~