35.biggestPowerOf2

Write a new function named biggestPowerOf2 that receives a number as a parameter, and returns the biggest positive power of 2 that is less than or equal to this number.

If no positive power of 2 is less than or equal to the number, the function should return -1.

Example 1

Input

number

Output

Example 2

Input

number

Output

Example 3

Input

number

Output

Example 4

Input

number

Output

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