#include <iostream>
#include <algorithm>
#define MAX 1010
using namespace std;
struct Bone {
int value;
int volume;
} bones[MAX];
int dp[MAX][MAX];
int n, v;
void init() {
scanf_s("%d %d", &n, &v);
for (int i = 0; i < n; i++) {
scanf_s("%d", &bones[i].value);
for (int j = 0; j < n; j++) {
dp[i][j] = 0;
}
}
for (int i = 0; i < n; i++) {
scanf_s("%d", &bones[i].volume);
}
}
void collectBone(int number, int volume) {
for (int i = 1; i <= number; i++) {
for (int j = 0; j <= volume; j++) {
if (j < bones[i - 1].volume) {
dp[i][j] = dp[i - 1][j];
}
else {
dp[i][j] = max(dp[i - 1][j - bones[i - 1].volume] + bones[i - 1].value, dp[i - 1][j]);
}
}
}
}
void solve() {
collectBone(n, v);
cout << dp[n][v] << endl;
}
int main() {
int t;
cin >> t;
while (t--) {
init();
solve();
}
return 0;
}