Odd Sum

Given a range [a, b], you are to find the summation of all the odd integers in this range. For example, the summation of all the odd integers in the range [3, 9] is 3 + 5 + 7 + 9 = 24.

Input 

There can be at multiple test cases. The first line of input gives you the number of test cases, T (1 <= T <= 100). Then T test cases follow. Each test case consists of 2 integers a and b (0<= a <= b <= 100) in two separate lines.

Output 

For each test case you are to print one line of output - the serial number of the test case followed by the summation of the odd integers in the range [a, b].

Sample Input 

2

1

5

3

5

Sample Output 

Case 1: 9

Case 2: 8