# The Robbery

In the downtown of Bucharest there is a very big bank with a very big vault. Inside the vault there are N very big boxes numbered from 1 to N. Inside the box with number k there are k very big diamonds, each of weight W_k and cost C_k.

John and Brus are inside the vault at the moment. They would like to steal everything, but unfortunately they are able to carry diamonds with the total weight not exceeding M.

Your task is to help John and Brus to choose diamonds with the total weight less than or equal to M and the maximal possible total cost.

## Input

The first line contains single integer T – the number of test cases. Each test case starts with a line containing two integers N and M separated by a single space. The next line contains N integers W_k separated by single spaces. The following line contains N integers C_k separated by single spaces.

## Output

For each test case print a single line containing the maximal possible total cost of diamonds.

Constraints

1 <= T <= 74,

1 <= N <= 15,

1 <= M <= 1000000000 (10^9),

1 <= W_k, C_k <= 1000000000 (10^9).