#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vl vector<ll>
#define vs vector<string>
#define vb vector<bool>
#define vc vector<char>
#define ull unsigned long long
#define pll pair<ll, ll>
#define pb push_back
#define fi first
#define se second
#define ff(i, p, x) for(ll i = p; i < x; i++)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define ed "\n"
#define IO ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll MOD = 1e9+7;
int main(){
IO
ll n;
cin >> n;
vl arr(n), p(n), v(n);
ff(i, 0, n){
cin >> arr[i];
arr[i]--;
}
ff(i, 0, n){
cin >> p[i];
}
ff(i, 0, n){
cin >> v[i];
}
sort(all(p));
sort(rall(v));
set<ll> dwarves(all(p));
ll c = 0;
for(ll s : v){
auto it = dwarves.upper_bound(s);
if(it != dwarves.end()){
c++;
dwarves.erase(it);
}
}
cout << c;
return 0;
}
