Go: package main

import (
	"bufio"
	"os"
	"strconv"
	"strings"
	"sort"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

func main() {
	for scanner.Scan() {
		n, _ := strconv.Atoi(scanner.Text())
		if n == 0 {
			break
		}
		hr := make([]entry, 0)
		for i := 0; i < n; i++ {
			scanner.Scan()
			buf := strings.Split(scanner.Text(), " ")
			first, _ := strconv.Atoi(buf[0])
			second, _ := strconv.Atoi(buf[1])
			mt := entry{first, second}
			hr = append(hr, mt)
		}
		scanner.Scan()
		m, _ := strconv.Atoi(scanner.Text())
		for i := 0; i < m; i++ {
			scanner.Scan()
			buf := strings.Split(scanner.Text(), " ")
			first, _ := strconv.Atoi(buf[0])
			second, _ := strconv.Atoi(buf[1])
			mt := entry{first, second}
			hr = append(hr, mt)
		}
		sort.Sort(ByFirst(hr))
		fmt.Println(LIS(hr))
	}
}

type entry struct {
	first, second int
}

type ByFirst []entry

func(f ByFirst) Len() int {
	return len(f)
}

func (f ByFirst) Swap(i, j int) {
	f[i], f[j] = f[j], f[i]
}

func (f ByFirst) Less(i, j int) bool {
	return f[i].first < f[j].first
}

func LIS(hr []entry) int {
	n := len(hr)
	lis := make([]int, n)
	lis[n-1] = 1
	for i := n-2; i > -1; i-- {
		m := 0
		for j := i+1; j < n; j++ {
			if hr[i].first < hr[j].first && hr[i].second < hr[j].second && lis[j] > m {
				m = lis[j]
			}
		}
		lis[i] = m+1
	}
	return lis[0]
}

C++: #include <bits/stdc++.h>
#define REP(i,n) for(int i=0; i<n; i++)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();i++)
#define ALL(c) (c).begin(), (c).end() 
using namespace std;

struct doll {
	int h, r; // h, r <= 1,000
	doll() {}
	bool operator<(const doll& right) const {
		return h == right.h ? r < right.r : h < right.h;
	}
	bool bigger_than(const doll d) {
		return h > d.h && r > d.r;
	}
};

#define MAX 100

int n, m; // n, m <= 100
vector<doll> dolls;
int dp[MAX * 2]; // dp[i]: i??????????????¢?????????????????£????????????

int main()
{	
	int maxval, i;
/************** input **************/
	while(cin >> n, n) {
		for(i = 0; i < n; i++) {
			doll tmp;
			cin >> tmp.h >> tmp.r;
			dolls.push_back(tmp);
		}
		cin >> m;
		for(i = 0; i < m; i++) {
			doll tmp;
			cin >> tmp.h >> tmp.r;
			dolls.push_back(tmp);
		}
/************** solve **************/
		sort(ALL(dolls));
		for(i = 0; i < n + m; i++) {
			maxval = 0;
			for(int j = 0; j < i; j++) 
				if(dolls.at(i).bigger_than(dolls.at(j)))
					maxval = max(maxval, dp[j]);
			dp[i] = maxval + 1;
		}
/************** output **************/
		maxval = 0;
		for(i = 0; i < n + m; i++)
			maxval = max(maxval, dp[i]);
		cout << maxval << endl;
	}
}

C++: #include<iostream>
#include<queue>
#include<algorithm>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define rep(i,a) loop(i,0,a)
using namespace std;
typedef pair<int,int> pii;

int main(){
	int m,n,h,r;
	vector<pii> mato;
	while(cin>>n,n){
		mato.clear();
		rep(i,n){cin>>h>>r;mato.push_back(pii(h,r));}
		cin>>m;
		rep(i,m){cin>>h>>r;mato.push_back(pii(h,r));}
		sort(mato.begin(),mato.end());
		pii now=mato[0];
		int cnt=1;
		loop(i,1,mato.size()){
			if(now.first<mato[i].first && now.second<mato[i].second){
				now=mato[i];
				cnt++;
			}
		}
		cout<<cnt<<endl;
	}
	return 0;
}

C++: #include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <cstring>
#include <sstream>
#include <cassert>
#include <list>
using namespace std;
static const double EPS = 1e-5;
typedef long long ll;
typedef pair<int,int> PI;
typedef vector<int> vi;
#define rep(i,n) for(int i=0;i<(int)n;++i)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)
#define ALL(c) (c).begin(), (c).end()
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
#define F first
#define S second


int dx[]={0,1,0,-1},dy[]={1,0,-1,0};

typedef struct{
  int h,r;
}mat;

bool lessh(const mat&l,const mat&r){return l.h<r.h;};
bool lessr(const mat&l,const mat&r){return l.r<r.r;};





main(){
  int n;
  while(cin>>n,n){
    vector<PI> hr;
    int low[200]={0},ans=0;
    int h,r;
    rep(i,n){
      cin>>h>>r;
      hr.pb(mp(h,r));
    }

    int m;
    cin>>m;
    rep(i,m){
      cin>>h>>r;
      hr.pb(mp(h,r));
    }


    sort(hr.begin(),hr.end());

    rep(i,n+m){
      rep(j,i){
	if(hr[j].F<hr[i].F && hr[j].S<hr[i].S){
	  low[i]=max(low[i],low[j]+1);
	  ans=max(ans,low[i]);
	}
      }
    }
    //rep(i,m+n)cout<<hr[i].h<<" "<<hr[i].r<<" "<<low[i]+1<<endl;
    cout<<ans+1<<endl;
  }
}

C++: #include<iostream>
#include<algorithm>
#include<vector>
#include<stack>
#include<map>
#include<set>
#include<queue>
#include<cstdio>
#include<climits>
#include<cmath>
#include<cstring>
#include<string>
#include<sstream>
#include<numeric>
#include<cassert>

#define f first
#define s second
#define mp make_pair

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define rep(i,s,n) for(int i=(s); i<(int)(n); i++)
#define FOR(i,c) for(__typeof((c).begin()) i=(c).begin(); i!=(c).end(); i++)
#define ALL(c) (c).begin(), (c).end()
#define IN(x,s,g) ((x) >= (s) && (x) < (g))
#define ISIN(x,y,w,h) (IN((x),0,(w)) && IN((y),0,(h)))
#define print(x) printf("%d\n",x)

using namespace std;

typedef unsigned int uint;
typedef long long ll;

const int _dx[] = {0,1,0,-1};
const int _dy[] = {-1,0,1,0};

int getInt(){
  int ret = 0,c;
  c = getchar();
  while(!isdigit(c)) c = getchar();
  while(isdigit(c)){
    ret *= 10;
    ret += c - '0';
    c = getchar();
  }
  return ret;
}

int n;
int m;
pair<int,int> h[200];

int dp[2][200];

int solve(int pos, int size, int s2){
  if(pos == n+m) return 0;

  if(dp[0][pos] == -1)
    dp[0][pos] = solve(pos+1, size, s2);

  if(size < h[pos].s && s2 < h[pos].f){
    if(dp[1][pos] == -1)
      dp[1][pos] = solve(pos+1, h[pos].s, h[pos].f) + 1;
  }else
    dp[1][pos] = 0;

  return max(dp[0][pos], dp[1][pos]);
}

int main(){
  while(n = getInt()){
    REP(i,n){
      h[i].f = getInt();
      h[i].s = getInt();
    }

    m = getInt();
    REP(i,m){
      h[i+n].f = getInt();
      h[i+n].s = getInt();
    }

    sort(h, h+n+m);

    memset(dp, -1, sizeof(dp));

    print(solve(0,-1,-1));

  }
  return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>

using namespace std;

#define rep(i,j) REP((i), 0, (j))
#define REP(i,j,k) for(int i=(j);(i)<(k);++i)
#define BW(a,x,b) ((a)<=(x)&&(x)<=(b))
#define MP(a, b) make_pair(a, b)
#define F first
#define S second
#define INF 1 << 30

typedef pair<int, int> pi;
typedef pair<int, pi> pii;
typedef vector<int> vi;
typedef queue<int> qi;
typedef long long ll;

int n, m;
vector<pi>s;
int dp[1024];

int main(){
  while(scanf("%d", &n) && n){
    s.clear();
    int h, r;
    rep(i, n){
      scanf("%d%d", &h, &r);
      s.push_back(MP(h, r));
    }
    scanf("%d", &m);
    rep(i, m){
      scanf("%d%d", &h, &r);
      s.push_back(MP(h, r));
    }

    sort(s.begin(), s.end());
    memset(dp, 0, sizeof(dp));

    int res = 0;
    rep(i, s.size()){
      dp[i] = 1;
      rep(j, i) if(s[j].F < s[i].F && s[j].S < s[i].S){
	dp[i] = max(dp[i], dp[j] + 1);
      }
      res = max(res, dp[i]);
    }
    printf("%d\n", res);
  }
  return 0;
}