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

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, ans = 0;
    cin >> n;
    vector<int> a(n), b(n);
    cin >> a >> b;
    for(int i = 0; i < n; i++) ans += a[i] <= b[i];
    cout << ans << '\n';
}