#include<bits/stdc++.h>
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define endl '\n'
using namespace std;
#define int long long
const int N=1e5+10;
const int M=114514;
struct Time{
	int a,b;
}p[2][N];
bool cmpa(Time x,Time y){return x.a<y.a;}

int n,m[2];

int bri[2][N];
void solve(int flag){
	int pl[N]={0};
	for(int i=1;i<=m[flag];i++){
		int j=1;
		while(pl[j]>=p[flag][i].a)j++;
		pl[j]=p[flag][i].b;
		bri[flag][j]++;
	}
	return;
}

signed main(){
	IOS
//	freopen("P7913_22.in","r",stdin);	
//	freopen("airport3.in","r",stdin);
//	freopen("answer.txt","w",stdout);
	cin>>n>>m[0]>>m[1];
	for(int i=1;i<=m[0];i++){
		cin>>p[0][i].a>>p[0][i].b;
	}
	sort(&p[0][1],&p[0][1]+m[0],cmpa);
	solve(0);
	for(int i=1;i<=m[1];i++){
		cin>>p[1][i].a>>p[1][i].b;
	}
	sort(&p[1][1],&p[1][1]+m[1],cmpa);
	solve(1);
	for(int i=2;i<=n;i++){
		bri[0][i]+=bri[0][i-1];
		bri[1][i]+=bri[1][i-1];
	}
	int ciallo=-M;
	int tmp;
	for(int i=0;i<=n;i++){
		tmp=bri[1][i]+bri[0][n-i];
		if(tmp>ciallo){
			ciallo=tmp;
		}
	}
	cout<<ciallo<<endl;
}