#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    long n,sum=0,m;
    cin>>n;
    long p[n],c[n];
    for(long i=0;i<n;i++)
    {
        cin>>p[i];
      sum=sum+p[i];
     }
    for(long i=0;i<n;i++)
        cin>>c[i];
    cin>>m;
    sort(p,p+n);
    for(long i=0;i<m-1;i++)
        sum-=p[i];
    cout<<sum;
    return 0;
}