#include <bits/stdc++.h>
#define all(v) (v).ibegin(),(v).end()
#define ssum(v) accumulate(all(v),0)
#define mmax(v) *max_element(all(v))
#define mmin(v) *min_element(all(v))
#define st(v) sort((v).begin(),(v).end())
#define rst(v) sort((v).rbegin(),(v).rend())
#define ll long long
#define ull unsigned long long
#define OVERLOAD_REP(_1, _2, _3, name, ...) name
#define rrep(i,n) for(int i=1;i<=n;i++)
#define REP1(i, n) for (auto i = std::decay_t<decltype(n)>{}; (i) != (n); ++(i))
#define REP2(i, l, r) for (auto i = (l); (i) != (r); ++(i))
#define rep(...) OVERLOAD_REP(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int cnt=0;
    int n;cin>>n;
    vector<int>a(n),b(n);
    rep(i,n)cin>>a[i];
    rep(i,n)cin>>b[i];
    rep(i,n){
        if(a[i]<=b[i])cnt++;
    }
    cout<<cnt<<endl;
}