package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	var n, z int
	fmt.Fscan(in, &n, &z)
	
	x := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Fscan(in, &x[i])
	}
	
	sort.Ints(x)
	
	i, j, ans := 0, n/2, 0
	for i < n/2 && j < n {
		if x[j]-x[i] >= z {
			ans++
			i++
			j++
		} else {
			j++
		}
	}
	
	fmt.Println(ans)
}