Write a Python function that takes a positive integer and returns the sum of the cube of all positive integers smaller than the specified number.

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def sum_of_cubes(n):
 n -= 1
 total = 0
 while n > 0:
   total += n * n * n
   n -= 1
 return total
print("Sum of cubes smaller than the specified number: ",sum_of_cubes(3))