package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var t int
	if _, err := fmt.Fscan(reader, &t); err != nil {
		return
	}

	for test := 0; test < t; test++ {
		var n, k int
		fmt.Fscan(reader, &n, &k)

		a := make([]int, n)
		for i := 0; i < n; i++ {
			fmt.Fscan(reader, &a[i])
		}

		sort.Ints(a)

		score := 0
		for i := 0; i < n-2*k; i++ {
			score += a[i]
		}
		for i := n - 2*k; i < n-k; i++ {
			score += a[i] / a[i+k]
		}

		fmt.Fprintln(writer, score)
	}
}