EVacuate to Moon

#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;
    cin>>t;

    while(t--)
    {
        long long int n, m, h;
        cin>>n>>m>>h;

        vector<long long int> car(n);
        for(auto &e: car)           cin>>e;
        vector<long long int> outlet(m);
        for(auto &e: outlet)        cin>>e;

        sort(car.rbegin(), car.rend());
        sort(outlet.rbegin(), outlet.rend());

        long long int ans = 0;

        for(int i=0, j=0; i<n && j<m; i++, j++)
            ans += min({car[i], h*outlet[j]});

       cout<<ans<<"\n";
    }
}