#include<bits/stdc++.h>
using namespace std;
#define fi first
#define sc second
#define pii pair<int,int>
#define pb push_back
#define umap unordered_map
#define mset multiset
#define pq priority_queue
#define ull unsigned long long
#define i128 __int128
const int maxn=2e5+10;
int n,x[maxn],m,y[maxn];
vector<int> vec[maxn];
void solve(){
    cin>>n;
    for(int i=1;i<=n;i++) cin>>x[i]>>y[i];
    cin>>m;
    for(int i=1;i<=m;i++){
        int a,b;
        cin>>a>>b;
        vec[a].pb(b);
    }
    int res=1e9;
    for(int i=1;i<=n;i++){
        for(int j=0;j<=1e3;j++){
            if(abs(x[i]-j)>res) continue;
            if(vec[j].empty()) continue;
            auto p=upper_bound(vec[j].begin(),vec[j].end(),y[i]);
            if(p!=vec[j].end()) res=min(res,abs(x[i]-j)+abs(y[i]-(*p)));
            if(p!=vec[j].begin()) p--,res=min(res,abs(x[i]-j)+abs(y[i]-(*p)));
        }
    }
    cout<<res<<endl;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--) solve();
    return 0;
}
/*
Samples
input:

output:

THINGS TODO:
??freopen???????
????
????????????
*/