import sys

# from https://github.com/not522/ac-library-python
### ACL ###
import typing
 
def _ceil_pow2(n: int) -> int:
    x = 0
    while (1 << x) < n:
        x += 1
 
    return x
 
 
def _bsf(n: int) -> int:
    x = 0
    while n % 2 == 0:
        x += 1
        n //= 2
 
    return x
 
class SegTree:
    def __init__(self,
                 op: typing.Callable[[typing.Any, typing.Any], typing.Any],
                 e: typing.Any,
                 v: typing.Union[int, typing.List[typing.Any]]) -> None:
        self._op = op
        self._e = e
 
        if isinstance(v, int):
            v = [e] * v
 
        self._n = len(v)
        # self._log = atcoder._bit._ceil_pow2(self._n)
        self._log = _ceil_pow2(self._n)
        self._size = 1 << self._log
        self._d = [e] * (2 * self._size)
 
        for i in range(self._n):
            self._d[self._size + i] = v[i]
        for i in range(self._size - 1, 0, -1):
            self._update(i)
 
    def set(self, p: int, x: typing.Any) -> None:
        assert 0 <= p < self._n
 
        p += self._size
        self._d[p] = x
        for i in range(1, self._log + 1):
            self._update(p >> i)
 
    def get(self, p: int) -> typing.Any:
        assert 0 <= p < self._n
 
        return self._d[p + self._size]
 
    def prod(self, left: int, right: int) -> typing.Any:
        assert 0 <= left <= right <= self._n
        sml = self._e
        smr = self._e
        left += self._size
        right += self._size
 
        while left < right:
            if left & 1:
                sml = self._op(sml, self._d[left])
                left += 1
            if right & 1:
                right -= 1
                smr = self._op(self._d[right], smr)
            left >>= 1
            right >>= 1
 
        return self._op(sml, smr)
 
    def all_prod(self) -> typing.Any:
        return self._d[1]
 
    def max_right(self, left: int,
                  f: typing.Callable[[typing.Any], bool]) -> int:
        assert 0 <= left <= self._n
        assert f(self._e)
 
        if left == self._n:
            return self._n
 
        left += self._size
        sm = self._e
 
        first = True
        while first or (left & -left) != left:
            first = False
            while left % 2 == 0:
                left >>= 1
            if not f(self._op(sm, self._d[left])):
                while left < self._size:
                    left *= 2
                    if f(self._op(sm, self._d[left])):
                        sm = self._op(sm, self._d[left])
                        left += 1
                return left - self._size
            sm = self._op(sm, self._d[left])
            left += 1
 
        return self._n
 
    def min_left(self, right: int,
                 f: typing.Callable[[typing.Any], bool]) -> int:
        assert 0 <= right <= self._n
        assert f(self._e)
 
        if right == 0:
            return 0
 
        right += self._size
        sm = self._e
 
        first = True
        while first or (right & -right) != right:
            first = False
            right -= 1
            while right > 1 and right % 2:
                right >>= 1
            if not f(self._op(self._d[right], sm)):
                while right < self._size:
                    right = 2 * right + 1
                    if f(self._op(self._d[right], sm)):
                        sm = self._op(self._d[right], sm)
                        right -= 1
                return right + 1 - self._size
            sm = self._op(self._d[right], sm)
 
        return 0
 
    def _update(self, k: int) -> None:
        self._d[k] = self._op(self._d[2 * k], self._d[2 * k + 1])
 
### ACL ###

input = sys.stdin.readline
 
N, K = map(int, input().split())
A = []
for _ in range(N):
    A.append(int(input()))

MAX_A = 3*10**5+5
# (i番目までを使ったときの）末尾がaの部分列の長さ
dp = [0 for _ in range(MAX_A)]
segtree = SegTree(max, 0, [0] * MAX_A)
for i in range(N):
    x = A[i]
    l = max(0, x-K)
    r = min(MAX_A, x+K+1)
    now = segtree.prod(l, r) + 1
    segtree.set(x, now)
 
print(segtree.prod(0, MAX_A)) 

Measured memory_bytes: 116320