//Coded By - Moon Knight
#include <bits/stdc++.h>
#define int long long
const int mod = 1000000007;
using namespace std;

int helpera(int arr[], int n, vector<int> kk)
{
    int sum = 0;
    for (int i = 0; i < kk.size(); i++)
    {
        sum += arr[kk[i]];
    }
    return sum;
}
int solve(int arr[], int brr[], int n, int k, vector<int> kk, int i)
{
    if (k==0 and i == n)
    {
        return min(helpera(arr, n, kk), helpera(brr, n, kk));
    }

    if (k<0 or i>n)
    {
        return -1 * mod;
    }

    int exc = solve(arr, brr, n, k, kk, i + 1);

    kk.push_back(i);
    int inc = solve(arr, brr, n, k-1, kk, i + 1);

    return max(inc, exc);
}

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int test;
    cin >> test;
    while (test--) {

        int n;
        cin >> n;
        int k;
        cin >> k;
        int arr[n];
        int brr[n];
        for (int i = 0; i < n; i++)
        {
            cin >> arr[i];
        }

        for (int i = 0; i < n; i++)
        {
            cin >> brr[i];
        }
        vector<int> kk;
        cout << solve(arr, brr, n, k, kk, 0) << endl;

    }
    return 0;
}