#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back 
#define rep(i,n) for(int i=0;i<n;i++)
#define Rep(i,n) for(ll i=0;i<n;i++)
#define REP(i,a,b) for(int i=a;i<=b;i++)
#define sz(x) x.size()
#define all(v) v.begin(),v.end()
#define endl '\n'

 
void solve()  
{
  ll t;
  cin>>t;
  std::vector<int> v(t),s(t);
  rep(i,t){
    cin>>v[i];
  }
  rep(i,t){
    cin>>s[i];
  }
  int coun =0;
  rep(i,t){
    if(v[i] <= s[i]){
      coun++;
    }
  }
  cout << coun;
}
int main()
{
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
        freopen("Error.txt", "w", stderr);
    #endif

    ios::sync_with_stdio(false);
    cin.tie(0);

    
    solve();
    return 0;
}