// #include <bits/allocator.h> // Temp fix for gcc13 global pragma
// #pragma GCC target("avx2,bmi2,popcnt,lzcnt")
// #pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
// #include <x86intrin.h>
using namespace std;
#if __cplusplus >= 202002L
using namespace numbers;
#endif
#ifdef LOCAL
	#include "Debug.h"
#else
	#define debug_endl() 42
	#define debug(...) 42
	#define debug2(...) 42
	#define debugbin(...) 42
#endif



int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(ios::badbit | ios::failbit);
	int n;
	cin >> n;
	vector<array<int, 2>> a(n);
	for(auto &[x, y]: a){
		cin >> x >> y;
	}
	int m;
	cin >> m;
	vector<array<int, 2>> b(m);
	for(auto &[x, y]: b){
		cin >> x >> y;
	}
	int res = numeric_limits<int>::max();
	for(auto rep = 2; rep; -- rep){
		for(auto rep = 2; rep; -- rep){
			vector<vector<array<int, 2>>> event(2001);
			debug(a);
			debug(b);
			for(auto [x, y]: a){
				event[x].push_back({0, y});
			}
			for(auto [x, y]: b){
				event[x].push_back({1, y});
			}
			vector<int> opt_dif(2001, numeric_limits<int>::min() / 2);
			for(auto dif = 0; dif <= 2000; ++ dif){
				ranges::sort(event[dif] | ranges::views::reverse);
				for(auto [type, sum]: event[dif]){
					if(type == 0){
						for(auto psum = 0; psum <= 2000; ++ psum){
							res = min(res, abs(sum - psum) + dif - opt_dif[psum]);
						}
					}
					else{
						opt_dif[sum] = max(opt_dif[sum], dif);
					}
				}
			}
			swap(a, b);
		}
		for(auto &[x, y]: a){
			x = 1000 - x;
		}
		for(auto &[x, y]: b){
			x = 1000 - x;
		}
	}
	cout << res << "\n";
	return 0;
}

/*

*/