#include <bits/stdc++.h>

using namespace std;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n; cin >> n;
    assert(3 <= n && n <= 100);
    vector<int> a(n), b(n);
    for(int i = 0; i < n; i++){
        cin >> a[i];
        assert(1 <= a[i] && a[i] <= 100);
    }
    for(int i = 0; i < n; i++){
        cin >> b[i];
        assert(1 <= b[i] && b[i] <= 100);
    }

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