#include <bits/stdc++.h>

using namespace std;

const int D = 1e6 + 2;

vector<int> M[(D << 1) + 6];
vector< pair<int, int> > id;

signed main()
{
    int n, m;
    scanf("%d%d", &n, &m);
    for (int i = 1, x; i <= n; ++i) {
        scanf("%d", &x);
        M[x + D].push_back(i);
    }
    int res = 0;
    for (int i = -D; i <= D; ++i) {
        id.clear();
        if (M[i + D].empty()) {
            continue;
        }
        for (auto x : M[i + D]) {
            id.push_back(make_pair(x, -1));
        }
        if (i - m >= -D && i - m <= D) {
            for (auto x : M[i - m + D]) {
                id.push_back(make_pair(x, 1));
            }
        }
        sort(id.begin(), id.end());
        int s = 0, mx = 0;
        for (auto [x, y] : id) {
            s += y;
            if (s < 0) {
                s = 0;
            }
            mx = max(mx, s);
        }
        res = max(res, mx + (int)M[i + D].size());
    }
    printf("%d\n", res);
    return 0;
}#include <bits/stdc++.h>

using namespace std;

const int N = 1e6 + 5, D = 1e6;

vector<int> M[D << 1];
vector< pair<int, int> > id;

signed main()
{
    int n, m;
    scanf("%d%d", &n, &m);
    for (int i = 1, x; i <= n; ++i) {
        scanf("%d", &x);
        M[x + D].push_back(i);
    }
    int res = 0;
    for (int i = -D; i <= D; ++i) {
        id.clear();
        for (auto x : M[i + D]) {
            id.push_back(make_pair(x, -1));
        }
        if (i - m >= -D && i - m <= D) {
            for (auto x : M[i - m + D]) {
                id.push_back(make_pair(x, 1));
            }
        }
        sort(id.begin(), id.end());
        int s = 0, mx = 0;
        for (auto [x, y] : id) {
            s += y;
            if (s < 0) {
                s = 0;
            }
            mx = max(mx, s);
        }
        res = max(res, mx + (int)M[i + D].size());
    }
    printf("%d\n", res);
    return 0;
}

answer.code:45:2: error: stray ‘#’ in program
   45 | }#include <bits/stdc++.h>
      |  ^
answer.code: In function ‘int main()’:
answer.code:34:19: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’
   34 |         for (auto [x, y] : id) {
      |                   ^
answer.code: At global scope:
answer.code:45:3: error: ‘include’ does not name a type
   45 | }#include <bits/stdc++.h>
      |   ^~~~~~~
answer.code:49:24: error: redefinition of ‘const int D’
   49 | const int N = 1e6 + 5, D = 1e6;
      |                        ^
answer.code:5:11: note: ‘const int D’ previously defined here
    5 | const int D = 1e6 + 2;
      |           ^
answer.code:51:13: error: conflicting declaration ‘std::vector<int> M [2000004]’
   51 | vector<int> M[D << 1];
      |             ^
answer.code:7:13: note: previous declaration as ‘std::vector<int> M [2000010]’
    7 | vector<int> M[(D << 1) + 6];
      |             ^
answer.code:52:26: error: redefinition of ‘std::vector<std::pair<int, int> > id’
   52 | vector< pair<int, int> > id;
      |                          ^~
answer.code:8:26: note: ‘std::vector<std::pair<int, int> > id’ previously declared here
    8 | vector< pair<int, int> > id;
      |                          ^~
answer.code:54:8: error: redefinition of ‘int main()’
   54 | signed main()
      |        ^~~~
answer.code:10:8: note: ‘int main()’ previously defined here
   10 | signed main()
      |        ^~~~
answer.code: In function ‘int main()’:
answer.code:75:19: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’
   75 |         for (auto [x, y] : id) {
      |                   ^
answer.code: In function ‘int main()’:
answer.code:13:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   13 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
answer.code:15:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   15 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~
answer.code: In function ‘int main()’:
answer.code:57:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   57 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
answer.code:59:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   59 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~