#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define f first
#define s second
#define chmin(a, b) a = min(a,b)
#define chmax(a, b) a = max(a,b)
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define all(x) x.begin(),x.end()
#define v vector
int main() {
ios::sync_with_stdio(false); cin.tie(0);
int n, d; cin >> n >> d;
v<int> dp;
auto doit = [&](int a) {
int pos = lower_bound(all(dp),a)-dp.begin();
if (pos==dp.size()) {dp.pb(a);}
else {dp[pos] = a;}
};
F0R(i,n) {
int a; cin >> a;
doit(a); doit(a+d);
} cout << dp.size() << '\n';
/*
positive d: do suffix
negative d: do prefix (which is same as positive d on suffix)
positive d:
two lis arrays
one is without adding, one is with
without adding: do it normally
with adding: do it normally
transition: look for a_i+d
need to prove monotonicity of both arrays
first array is easy
second = min a such that lis with additions of length i (monotonic)
transitions from first to second:
update first array, test updated val in second array, update second array?
no
do better idea
*/
}
