#include <iostream>
#include <vector>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<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 count = 0;
    for (int i = 0; i < N; ++i) {
        if (B[i] >= A[i]) {
            count++;
        }
    }
    cout << count << endl;
    return 0;
}