amizade.cpp

#include <bits/stdc++.h>
using namespace std;

int main(){

    int n,a,d;
    cin >> n >> a >> d;

    int res = 0;

    for(int i=0; i<n; i++){

        int m; cin >> m;

        int difAtual = abs(m - a);

        if(difAtual <= d) res++;
    }

    cout << res << endl;
    return 0;
}