#include <iostream>
#include <algorithm>
#include <cmath>
using namespace std;

int main() {
    int n, m, k;
    cin >> n >> m >> k;
    
    int apartments[n], applicants[m];
    
    for(int i = 0; i < n; i++) {
        cin >> apartments[i];
    }
    
    for(int i = 0; i < m; i++) {
        cin >> applicants[i];
    }
    
    sort(apartments, apartments + n);
    sort(applicants, applicants + m);
    
    int i = 0, j = 0;
    int result = 0;
    
    
    while(i < n and j < m) {
        if(abs(apartments[i] - applicants[j]) <= k) {
            i++;
            j++;
            result++;
        }
        else if(apartments[i] < applicants[j]) {
            i++;
        }
        else {
            j++;
        }
    }
    cout << result << endl;
    return 0;
}