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Give help to Megabyte

Megabyte attempted to take control of Hexadecimal by loading n different natural numbers (ranging from 1 to n) into her memory. However, Hexadecimal only recognizes numbers written entirely in binary (containing only the digits 0 and 1). Any number with other digits was ignored. Now, Megabyte wants to determine how many numbers were successfully stored in her memory.

Example 1

Input:

20

Output:

3

Example 2

Input:

72

Output:

3
main.cpp

main.cpp

C++

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