#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define pb push_back
#define ff first
#define ss second
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n; cin>>n;
    vector<int> a(n + 1), c(n + 1), f[n + 1];
    for (int i = 1; i <= n; i++){
        cin>>a[i]>>c[i];
        f[a[i]].pb(c[i]);
    }
    for (int i = 1; i <= n; i++){
        reverse(f[i].begin(), f[i].end());
    }
    vector<int> b(n + 1), d(n + 1);
    for (int i = 1; i <= n; i++){
        cin>>b[i]>>d[i];
    }
    
    vector<int> s(n + 1);
    int out = n;
    for (int i = n; i > 0; i--){
        int x = b[i];
        if (s[x] != f[x].size() && f[x][s[x]] <= d[i]){
            out--;
            s[x]++;
        }
    }
    
    cout<<out<<"\n";
}
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