Polycarp often uses his smartphone. He has already installed n applications on it. Application with number i takes up a_i units of memory.

Polycarp wants to free at least m units of memory (by removing some applications).

Of course, some applications are more important to Polycarp than others. He came up with the following scoring system — he assigned an integer b_i to each application: 

  * b_i = 1 — regular application; 
  * b_i = 2 — important application. 



According to this rating system, his phone has b_1 + b_2 + … + b_n convenience points.

Polycarp believes that if he removes applications with numbers i_1, i_2, …, i_k, then he will free a_{i_1} + a_{i_2} + … + a_{i_k} units of memory and lose b_{i_1} + b_{i_2} + … + b_{i_k} convenience points.

For example, if n=5, m=7, a=[5, 3, 2, 1, 4], b=[2, 1, 1, 2, 1], then Polycarp can uninstall the following application sets (not all options are listed below): 

  * applications with numbers 1, 4 and 5. In this case, it will free a_1+a_4+a_5=10 units of memory and lose b_1+b_4+b_5=5 convenience points; 
  * applications with numbers 1 and 3. In this case, it will free a_1+a_3=7 units of memory and lose b_1+b_3=3 convenience points. 
  * applications with numbers 2 and 5. In this case, it will free a_2+a_5=7 memory units and lose b_2+b_5=2 convenience points. 



Help Polycarp, choose a set of applications, such that if removing them will free at least m units of memory and lose the minimum number of convenience points, or indicate that such a set does not exist.

Input

The first line contains one integer t (1 ≤ t ≤ 10^4) — the number of test cases. Then t test cases follow.

The first line of each test case contains two integers n and m (1 ≤ n ≤ 2 ⋅ 10^5, 1 ≤ m ≤ 10^9) — the number of applications on Polycarp's phone and the number of memory units to be freed.

The second line of each test case contains n integers a_1, a_2, …, a_n (1 ≤ a_i ≤ 10^9) — the number of memory units used by applications.

The third line of each test case contains n integers b_1, b_2, …, b_n (1 ≤ b_i ≤ 2) — the convenience points of each application.

It is guaranteed that the sum of n over all test cases does not exceed 2 ⋅ 10^5.

Output

For each test case, output on a separate line: 

  * -1, if there is no set of applications, removing which will free at least m units of memory; 
  * the minimum number of convenience points that Polycarp will lose if such a set exists. 

Example

Input


5
5 7
5 3 2 1 4
2 1 1 2 1
1 3
2
1
5 10
2 3 2 3 2
1 2 1 2 1
4 10
5 1 3 4
1 2 1 2
4 5
3 2 1 2
2 1 2 1


Output


2
-1
6
4
3

Note

In the first test case, it is optimal to remove applications with numbers 2 and 5, freeing 7 units of memory. b_2+b_5=2.

In the second test case, by removing the only application, Polycarp will be able to clear only 2 of memory units out of the 3 needed.

In the third test case, it is optimal to remove applications with numbers 1, 2, 3 and 4, freeing 10 units of memory. b_1+b_2+b_3+b_4=6.

In the fourth test case, it is optimal to remove applications with numbers 1, 3 and 4, freeing 12 units of memory. b_1+b_3+b_4=4.

In the fifth test case, it is optimal to remove applications with numbers 1 and 2, freeing 5 units of memory. b_1+b_2=3.
import java.io.*;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringTokenizer;

public class CleaningThePhone {

    public static void main(String[] args) throws IOException {

        FastReader reader = new FastReader();
        FastWriter writer = new FastWriter();
        int numTests = reader.readSingleInt();

        for (int i = 0; i < numTests; i++) {
            int[] nm = reader.readIntArray(2);
            int numApps = nm[0], memoryToBeFreed = nm[1];
            int[] memoryUsage = reader.readIntArray(numApps);
            int[] appConvenience = reader.readIntArray(numApps);

            //Checking if its possible to remove the amount of memory.
            long memorySum = 0;
            int convenienceSum = 0;
            App[] apps = new App[numApps];
            for(int j = 0; j<numApps; j++){
                memorySum += memoryUsage[j];
                convenienceSum += appConvenience[j];
                apps[j] = new App(memoryUsage[j], appConvenience[j]);
            }

            if(memorySum < memoryToBeFreed){
                writer.writeSingleInteger(-1);
                continue;
            } else if(memorySum == memoryToBeFreed){
                writer.writeSingleInteger(convenienceSum);
                continue;
            }

            Arrays.sort(apps, new Comparator<App>() {
                @Override
                public int compare(App a, App b) {
                    if(a.priority > b.priority){
                        return -1;
                    } else if(a.priority == b.priority){
                        return b.memory-a.memory;
                    } else {
                        return 1;
                    }
                }
            });


            long erasedMemory = 0;
            int sumConvenience = 0;
            int j = 0;
            while(erasedMemory < memoryToBeFreed){
                erasedMemory += apps[j].memory;
                sumConvenience += apps[j].importance;
                j++;
            }

            int min = sumConvenience;
            //Here, we are at most 1 away from the answer.
            for(int k = 0; k<j-1; k++){
                if((erasedMemory - apps[k].memory) >= memoryToBeFreed){
                    min = Math.min(min, sumConvenience-apps[k].importance);
                }
            }


            sumConvenience -= apps[j-1].importance;
            erasedMemory -= apps[j-1].memory;
            for(int k = j; k<numApps; k++){
                if(erasedMemory + apps[k].memory >= memoryToBeFreed){
                    min = Math.min(min, sumConvenience+apps[k].importance);
                }
            }
            writer.writeSingleInteger(min);
        }
    }

    public static class App {

        int memory;
        int importance;
        int priority;

        public App(int memory, int importance) {
            if(importance == 1){
                priority = memory*2;
            } else {
                priority = memory;
            }
            this.memory = memory;
            this.importance = importance;
        }
    }




    public static void mergeSort(int[] a, int n) {
        if (n < 2) {
            return;
        }
        int mid = n / 2;
        int[] l = new int[mid];
        int[] r = new int[n - mid];

        for (int i = 0; i < mid; i++) {
            l[i] = a[i];
        }
        for (int i = mid; i < n; i++) {
            r[i - mid] = a[i];
        }
        mergeSort(l, mid);
        mergeSort(r, n - mid);

        merge(a, l, r, mid, n - mid);
    }


    public static void merge(int[] a, int[] l, int[] r, int left, int right) {

        int i = 0, j = 0, k = 0;
        while (i < left && j < right) {
            if (l[i] <= r[j]) {
                a[k++] = l[i++];
            }
            else {
                a[k++] = r[j++];
            }
        }
        while (i < left) {
            a[k++] = l[i++];
        }
        while (j < right) {
            a[k++] = r[j++];
        }
    }


    public static class FastReader {

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer tokenizer;


        public int readSingleInt() throws IOException {
            return Integer.parseInt(reader.readLine());
        }

        public int[] readIntArray(int numInts) throws IOException {
            int[] nums = new int[numInts];
            tokenizer = new StringTokenizer(reader.readLine());
            for(int i = 0; i<numInts; i++){
                nums[i] = Integer.parseInt(tokenizer.nextToken());
            }
            return nums;
        }

        public String readString() throws IOException {
            return reader.readLine();
        }

    }



    public static class FastWriter {

        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));


        public void writeSingleInteger(int i) throws IOException {
            writer.write(Integer.toString(i));
            writer.newLine();
            writer.flush();
        }

        public void writeSingleLong(long i) throws IOException {
            writer.write(Long.toString(i));
            writer.newLine();
            writer.flush();
        }

        public void writeIntArrayWithSpaces(int[] nums) throws IOException {
            for(int i = 0; i<nums.length; i++){
                writer.write(nums[i] + " ");
            }
            writer.newLine();
            writer.flush();
        }

        public void writeIntArrayWithoutSpaces(int[] nums) throws IOException {
            for(int i = 0; i<nums.length; i++){
                writer.write(Integer.toString(nums[i]));
            }
            writer.newLine();
            writer.flush();
        }

        public void writeString(String s) throws IOException {
            writer.write(s);
            writer.newLine();
            writer.flush();
        }

    }
}
