'''
ryCpe2014_001.py

http://uva.onlinejudge.org/external/107/10783.html

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
'''

SampleInput= '''
2
1
5
3
5
'''

SampleOutput= '''
Case 1: 9
Case 2: 8
'''

TestInput= '''
3
1
10
20
30
100
200
'''

TestOutput= '''
Case 1: 25
Case 2: 150
Case 3: 7650
'''

def 解題(inp, outp= None):

    if outp != None:
       S= outp.strip().split('\n')
    I= inp.strip().split('\n')
    T= int(I[0])

    O= ''
    for i in range(T):
        a= int(I[2*i+1])
        b= int(I[2*i+2])
        s= 0
        for x in range(a,b+1,2):
            s+=x
        o= 'Case %d: %d'%(i+1,s)
        #print(o)
        if outp != None: assert (o==S[i]), (o, S[i])
        O += o + '\n'
    O= O.strip()
    #print(O)
    return O

if __name__=='__main__':

    output0= 解題(SampleInput, SampleOutput)
    print(output0)


    output1= 解題(TestInput, TestOutput)
    print(output1)