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import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		int n = scn.nextInt();
		while (n-- != 0) {
			int b = scn.nextInt(), t = scn.nextInt(), s = scn.nextInt(), arr[] = new int[s], tot = 0;
			for (int i = 0; i < s; i++)
				arr[i] = scn.nextInt();
			Arrays.sort(arr);
			for (int i = 0; i < t; i++)
				tot += arr[i];
			if (b - tot >= 0)
				System.out.println(tot);
			else
				System.out.println("Impossible");
		}
	}
		/* 
    題目：ITSA Basic 題目35. 買獎品
    作者：1010
    時間：西元 2016 年 7 月 */
}