#!/bin/python3
import sys

def findTI(x,k,x0):
    t=x[x0]+k
    for i in range(x0,len(x)):
        if x[i]>t:
            return i-1
    return x0
def findHI(x,k,tI):
    t=x[tI]+k
    for i in range(tI,len(x)):
        if x[i]>t:
            return i
    return tI
n,k = input().strip().split(' ')
n,k = [int(n),int(k)]
x = [int(x_temp) for x_temp in input().strip().split(' ')]
x.sort()
numT,h=0,0
while True:
    t1=findTI(x,k,h)
    h=findHI(x,k,t1)
    numT+=1
    if x[t1]+k>=x[-1]:
        break
print(numT)