def area(x):
    return x * 2 - 4


b = int(input())
for i in range(b):
    c = int(input())
    print(f'Case {i + 1}: {area(c)}')

0227127393c705db639de7d0453e48cde24d535f
<mask token>

def area(x):
    return x * 2 - 4


<mask token>

def area(x):
    return x * 2 - 4


<mask token>
for i in range(b):
    c = int(input())
    print(f'Case {i + 1}: {area(c)}')

def area(x):
    return x * 2 - 4


b = int(input())
for i in range(b):
    c = int(input())
    print(f'Case {i + 1}: {area(c)}')
