#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using mint = atcoder::modint998244353;

int main(){
	int n;
	cin>>n;
	vector<int> a(n),b(n);
	rep(i,n) cin>>a.at(i);
	rep(i,n) cin>>b.at(i);
	int ans=0;
	rep(i,n) if(a.at(i)<=b.at(i)) ans++;
	cout<<ans<<endl;
}