A859.Hexadecimal's Numbers
普及/提高-
通过率:0%
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题目描述
One beautiful July morning a terrible thing happened in Mainframe: a mean virus Megabyte somehow got access to the memory of his not less mean sister Hexadecimal. He loaded there a huge amount of n different natural numbers from 1 to n to obtain total control over her energy.
But his plan failed. The reason for this was very simple: Hexadecimal didn't perceive any information, apart from numbers written in binary format. This means that if a number in a decimal representation contained characters apart from 0 and 1, it was not stored in the memory. Now Megabyte wants to know, how many numbers were loaded successfully.
输入格式
Input data contains the only number n ( 1<=n<=109 ).
输出格式
Output the only number — answer to the problem.
输入输出样例
输入#1
10
输出#1
2
说明/提示
For n = 10 the answer includes numbers 1 and 10.
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