#include <bits/stdc++.h>
int main() {
    // reading:
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    int n; std::cin >> n;
    std::multiset<int> r, q;
    for (int i = 0; i < n; i++) {
        int val;
        std::cin >> val;
        r.insert(val);
    }
    for (int i = 0; i < n; i++) {
        int val;
        std::cin >> val;
        q.insert(val);
    }
    // solving
    int answ{};
    // worst person tries to defeat a strongest person:
    for (auto it = r.begin(); it != r.end(); ) {
        if (auto jt = q.lower_bound(*it); jt != q.begin()) {
            q.erase(std::prev(jt));
            it = r.erase(it);
            answ++;
        } else // leave him along if he can't defeat someone
            it++;
    }
    // each person tries to do at least a draw:
    for (auto it = r.begin(); it != r.end(); ) {
        if (auto jt = q.lower_bound(*it); jt != q.end() && *jt == *it) {
            q.erase(jt);
            it = r.erase(it);
        } else
            it++;
    }
    // rest team members will lose:
    answ -= (int)r.size();
    // printing an answer:
    std::cout << answ << std::endl;
    return 0;
}