This is the easy version of the problem. The difference between the versions is that in this version, $$$k=0$$$. You can hack only if you solved all versions of this problem.

Ecrade has two sequences $$$a_0, a_1, \ldots, a_{n - 1}$$$ and $$$b_0, b_1, \ldots, b_{n - 1}$$$ consisting of integers. It is guaranteed that the sum of all elements in $$$a$$$ does not exceed the sum of all elements in $$$b$$$.

Initially, Ecrade can make exactly $$$k$$$ changes to the sequence $$$a$$$. It is guaranteed that $$$k$$$ does not exceed the sum of $$$a$$$. In each change:

Choose an integer $$$i$$$ ($$$0 \le i \lt n$$$) such that $$$a_i \gt 0$$$, and perform $$$a_i := a_i - 1$$$.

Then Ecrade will perform the following three operations sequentially on $$$a$$$ and $$$b$$$, which constitutes one round of operations:

For each $$$0 \le i \lt n$$$: $$$t := \min(a_i, b_i), a_i := a_i - t, b_i := b_i - t$$$;
For each $$$0 \le i \lt n$$$: $$$c_i := a_{(i - 1) \bmod n}$$$;
For each $$$0 \le i \lt n$$$: $$$a_i := c_i$$$;

Ecrade wants to know the minimum number of rounds required for all elements in $$$a$$$ to become equal to $$$0$$$ after exactly $$$k$$$ changes to $$$a$$$.

However, this seems a bit complicated, so please help him!

Input

Each test contains multiple test cases. The first line contains the number of test cases $$$t$$$ ($$$1 \le t \le 2\cdot 10^4$$$). The description of the test cases follows.

The first line of each test case contains two integers $$$n$$$, $$$k$$$ ($$$1 \le n \le 2 \cdot 10^5$$$, $$$k = 0$$$).

The second line of each test case contains $$$n$$$ integers $$$a_0, a_1, \ldots, a_{n - 1}$$$ ($$$1 \le a_i \le 10^9$$$).

The third line of each test case contains $$$n$$$ integers $$$b_0, b_1, \ldots, b_{n - 1}$$$ ($$$1 \le b_i \le 10^9$$$).

It is guaranteed that the sum of $$$n$$$ across all test cases does not exceed $$$2\cdot 10^5$$$. It is also guaranteed that in each test case the sum of $$$a$$$ does not exceed the sum of $$$b$$$, and that $$$k$$$ does not exceed the sum of $$$a$$$.

Output

For each test case, output the minimum number of rounds required for all elements in $$$a$$$ to become equal to $$$0$$$ after exactly $$$k$$$ changes to $$$a$$$.

Note

In this version, Ecrade cannot make changes to $$$a$$$.

In the first test case:

After the first round, $$$a=[0,0,0],b=[4,0,0]$$$.

In the second test case:

After the first round, $$$a=[3,0,0,1],b=[3,1,0,0]$$$;
After the second round, $$$a=[1,0,0,0],b=[0,1,0,0]$$$;
After the third round, $$$a=[0,1,0,0],b=[0,1,0,0]$$$;
After the fourth round, $$$a=[0,0,0,0],b=[0,0,0,0]$$$.

Canteen (Easy Version)

Examples