#include<bits/stdc++.h>
using namespace std;
 
int a[200005];
 
int main(){
    int n,m,k,ans=0;
    cin>>n>>m>>k;
    for(int i=0;i<n;i++){
        cin>>a[i];
    } sort(a,a+n);
    int aa; set<int>s;
    for(int i=0;i<m;i++){
        cin>>aa;
        s.insert(aa);
    }
    for(int i=0;i<n and (int)s.size() ;i++){
        int val=a[i]-k;
        auto it=lower_bound(s.begin(),s.end(),val);
        if(it!=s.end() and *it<= a[i]+k){
            s.erase(*it);
            ans++;
        }
    }
    cout<<ans<<endl;
 
    return 0;
}

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