#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string.h>
#include <cmath>
#include <vector>
using namespace std;
const int maxn=100000+5;
int coupon1[maxn];
int c1;
int coupon2[maxn];
int c2;
int product1[maxn];
int product2[maxn];
int p1,p2;

bool cmp(int a,int b){
    return a>b;
}
int main()
{
    int nc,np;
    long long tmp;
    c1=c2=p1=p2=0;
    scanf("%d",&nc);
    for(int i=0;i<nc;i++){
        scanf("%lld",&tmp);
        if(tmp>=0)
            coupon1[c1++]=tmp;
        else
            coupon2[c2++]=tmp;
    }
    scanf("%d",&np);
    for(int i=0;i<np;i++){
        scanf("%lld",&tmp);
        if(tmp>=0)
            product1[p1++]=tmp;
        else
            product2[p2++]=tmp;
    }
    long long ans=0;
    sort(coupon1,coupon1+c1,cmp);
    sort(product1,product1+p1,cmp);
    sort(coupon2,coupon2+c2);
    sort(product2,product2+p2);
    int min1=min(c1,p1);
    for(int i=0;i<min1;i++){
        ans+=coupon1[i]*product1[i];
    }
    int min2=min(c2,p2);
    for(int i=0;i<min2;i++){
        ans+=coupon2[i]*product2[i];
    }
    printf("%lld\n",ans);
    return 0;
}