You are an expert competitive programmer. You will be given a problem statement, test case constraints and example test inputs and outputs. Please reason step by step about the solution (that must respect memory and time limits), then provide a complete implementation in c++17.

Your solution must read input from standard input (cin), write output to standard output (cout).
Do not include any debug prints or additional output.

Put your final solution within a single code block:
```cpp
<your code here>
```

Execution time limit: 2.0 seconds
Memory limit: 256.0 MB

# Problem
Petya has come to the math exam and wants to solve as many problems as possible. He prepared and carefully studied the rules by which the exam passes.

The exam consists of $$$n$$$ problems that can be solved in $$$T$$$ minutes. Thus, the exam begins at time $$$0$$$ and ends at time $$$T$$$. Petya can leave the exam at any integer time from $$$0$$$ to $$$T$$$, inclusive.

All problems are divided into two types:

- easy problems — Petya takes exactly $$$a$$$ minutes to solve any easy problem;
- hard problems — Petya takes exactly $$$b$$$ minutes ($$$b > a$$$) to solve any hard problem.

Thus, if Petya starts solving an easy problem at time $$$x$$$, then it will be solved at time $$$x+a$$$. Similarly, if at a time $$$x$$$ Petya starts to solve a hard problem, then it will be solved at time $$$x+b$$$.

For every problem, Petya knows if it is easy or hard. Also, for each problem is determined time $$$t_i$$$ ($$$0 \le t_i \le T$$$) at which it will become mandatory (required). If Petya leaves the exam at time $$$s$$$ and there is such a problem $$$i$$$ that $$$t_i \le s$$$ and he didn't solve it, then he will receive $$$0$$$ points for the whole exam. Otherwise (i.e if he has solved all such problems for which $$$t_i \le s$$$) he will receive a number of points equal to the number of solved problems. Note that leaving at time $$$s$$$ Petya can have both "mandatory" and "non-mandatory" problems solved.

For example, if $$$n=2$$$, $$$T=5$$$, $$$a=2$$$, $$$b=3$$$, the first problem is hard and $$$t_1=3$$$ and the second problem is easy and $$$t_2=2$$$. Then:

- if he leaves at time $$$s=0$$$, then he will receive $$$0$$$ points since he will not have time to solve any problems;
- if he leaves at time $$$s=1$$$, he will receive $$$0$$$ points since he will not have time to solve any problems;
- if he leaves at time $$$s=2$$$, then he can get a $$$1$$$ point by solving the problem with the number $$$2$$$ (it must be solved in the range from $$$0$$$ to $$$2$$$);
- if he leaves at time $$$s=3$$$, then he will receive $$$0$$$ points since at this moment both problems will be mandatory, but he will not be able to solve both of them;
- if he leaves at time $$$s=4$$$, then he will receive $$$0$$$ points since at this moment both problems will be mandatory, but he will not be able to solve both of them;
- if he leaves at time $$$s=5$$$, then he can get $$$2$$$ points by solving all problems.

Thus, the answer to this test is $$$2$$$.

Help Petya to determine the maximal number of points that he can receive, before leaving the exam.

## Input Format
The first line contains the integer $$$m$$$ ($$$1 \le m \le 10^4$$$) — the number of test cases in the test.

The next lines contain a description of $$$m$$$ test cases.

The first line of each test case contains four integers $$$n, T, a, b$$$ ($$$2 \le n \le 2\cdot10^5$$$, $$$1 \le T \le 10^9$$$, $$$1 \le a < b \le 10^9$$$) — the number of problems, minutes given for the exam and the time to solve an easy and hard problem, respectively.

The second line of each test case contains $$$n$$$ numbers $$$0$$$ or $$$1$$$, separated by single space: the $$$i$$$-th number means the type of the $$$i$$$-th problem. A value of $$$0$$$ means that the problem is easy, and a value of $$$1$$$ that the problem is hard.

The third line of each test case contains $$$n$$$ integers $$$t_i$$$ ($$$0 \le t_i \le T$$$), where the $$$i$$$-th number means the time at which the $$$i$$$-th problem will become mandatory.

It is guaranteed that the sum of $$$n$$$ for all test cases does not exceed $$$2\cdot10^5$$$.

## Output Format
Print the answers to $$$m$$$ test cases. For each set, print a single integer — maximal number of points that he can receive, before leaving the exam.

## Examples
```input
10
3 5 1 3
0 0 1
2 1 4
2 5 2 3
1 0
3 2
1 20 2 4
0
16
6 20 2 5
1 1 0 1 0 0
0 8 2 9 11 6
4 16 3 6
1 0 1 1
8 3 5 6
6 20 3 6
0 1 0 0 1 0
20 11 3 20 16 17
7 17 1 6
1 1 0 1 0 0 0
1 7 0 11 10 15 10
6 17 2 6
0 0 1 0 0 1
7 6 3 7 10 12
5 17 2 5
1 1 1 1 0
17 11 10 6 4
1 1 1 2
0
1
```
```output
3
2
1
0
1
4
0
1
2
1
```

Now solve the problem and return the code.