#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(), (a).end()

const ll mod = 1e9 + 7;

int main() {
    cin.tie(nullptr);
    
    int N;
    cin >> N;
    vector<int> A(N), B(N);
    rep(i, 0, N) cin >> A[i];
    rep(i, 0, N) cin >> B[i];
    
    int cnt = 0;
    
    rep(i, 0, N) {
        if (A[i] <= B[i]) cnt++;
    }
    
    cout << cnt << '\n';
}