Problem

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Function

Problem

Function f with natural arguments and values ​​is defined like this:
 
f(0) = 0
f(1) = 1
f(2n) = f(n)
f(2n + 1) = f(n) + f(n + 1)
Compose a program to calculate f(n) given n.
 
Input
Given a single number n (1 ≤ n ≤ 1018).
 
Output
Print f(n)
 
Input Output
10 3

time 1000 ms
memory 256 Mb
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