Given a binary string of size n. you have to count all substring that has even value in its decimal form.

Note: we convert binary String Into decimal from left to right ( 10010:- in Decimal: 9 ).

Input: The first line of input contains an integer T i.e number of the test case. each test case contains n (that is the size of binary string ) and a Binary string of size n.

output: For each test case, In new line print the total count of even binary string.

Constraints:

 1 <= T <= 1000

1<=n<=10⁵

Example :

Input :

2

2

01

5

10010

output :

2

8

Explanation:

Test Case 1 :  substring  are :  0  , 01 , 1  in decimal form : 0 , 2 , 1 so total: 2 even decimal value.