Covid 19 By Mehraj

#include <bits/stdc++.h>

using namespace std;

long long n, q, d, ans = 0, x;
vector < long long > pos, type;
vector < int > mark, vis;


void affect(int x){
    //cout << x << endl;
    mark[x-1] = 1;
    if(vis[x-1]==1) return;
    vis[x-1] = 1;
        if(type[x-1] == 0){
            for(int j=x;j<n;j++){
                if(pos[j]-pos[x-1] > d) break;
                else affect(j+1);
            }
            for(int j=x-2;j>=0;j--){
                if(pos[x-1]-pos[j] > d) break;
                else affect(j+1);
            }
        }
        else {
            for(int j=x;j<n;j++){
                if(pos[j]-pos[x-1] > 2*d) break;
                else affect(j+1);
            }
            for(int j=x-2;j>=0;j--){
                if(pos[x-1]-pos[j] > 2*d) break;
                else affect(j+1);
            }
        }
        return;
}

int main()
{
    cin >> n;

    mark.assign(n,0);
    vis.assign(n,0);
    pos.assign(n,0);
    type.assign(n,0);

    for(int i=0;i<n;i++) cin >> pos[i];
    for(int i=0;i<n;i++) cin >> type[i];

       cin >> q >> d;

    for(int i=0;i<q;i++) {
        cin >> x;
        affect(x);
    }

    // for(auto num : mark) cout << num << endl;

    for(auto num : mark) if(num == 1) ans++;


    cout << ans << endl;

    return 0;
}