Given a positive integer n, calculate the following sum:
n + n/2 + n/4 + n/8 + ...

All elements of the sum are the results of integer division. Continue dividing the number until you reach a decimal (no decimals allowed in final answer).

Example
25 => 25 + 12 + 6 + 3 + 1 = 47

Tests
halvingSum(25)
halvingSum(127)

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