#include<cstdio>
#include<iostream>
#include<cmath>
#include<string>
#include<cstring>
#include<algorithm>
using namespace std;
int a[200005];
int main(){
	int n,k,t,sum;
	cin>>n>>k>>t;
	for(int i=1;i<=k;i++){
		cin>>a[i];
	} 
	sort(a+1,a+k+1);
	for(int i=1;i<k;i++){
		if(a[i+1]-a[i]<t){
			a[i+1]=-1;
			sum++;
			swap(a[i+1],a[i]);
			//cout<<a[i+1];
		}
	}
	cout<<sum;
    return 0;
}