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

int main(){
    int n;
    cin >> n;

    int a[n], b[n];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    for (int i = 0; i < n; i++) {
        cin >> b[i];
    }

    int ans = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] <= b[i]) {
            ans++;
        }
    }

    cout << ans << endl;
}