# 1-index
def segfunc(x, y):
    return max(x, y)

ide_ele = 0

class segtree:

    def __init__(self, init_val, segfunc, ide_ele):
        n = len(init_val)
        self.segfunc = segfunc
        self.ide_ele = ide_ele
        self.num = 1 << (n - 1).bit_length()
        self.tree = [ide_ele] * 2 * self.num

        for i in range(n):
            self.tree[self.num + i] = init_val[i]

        for i in range(self.num - 1, 0, -1):
            self.tree[i] = self.segfunc(self.tree[2 * i], self.tree[2 * i + 1])

    def update(self, k, x):
        k += self.num
        self.tree[k] = x
        while k > 1:
            self.tree[k >> 1] = self.segfunc(self.tree[k], self.tree[k ^ 1])
            k >>= 1

    def query(self, l, r):
        """
        [l, r)のsegfuncしたものを得る
        """
        res = self.ide_ele

        l += self.num
        r += self.num
        while l < r:
            if l & 1:
                res = self.segfunc(res, self.tree[l])
                l += 1
            if r & 1:
                res = self.segfunc(res, self.tree[r - 1])
            l >>= 1
            r >>= 1
        return res


N, K = map(int, input().split())
T = []
for i in range(N):
    a = int(input())
    T.append(a)

A = [0]*(max(T)+1)
s_tree = segtree(A, segfunc, ide_ele)
for i in range(N):
    a = T[i]
    p = s_tree.query(max(a - K, 0), min(a + K + 1, max(T)+1))
    s_tree.update(a, p + 1)

print(s_tree.query(0, max(T)+1))