AT_past202306_h 和で表現

When you represent an integer $ N $ as the sum of one or more distinct positive integers, at most how many positive integers can be used?

The input is given from Standard Input in the following format: > $ N $

Print the answer.

### Sample Explanation 1 We can represent $ 7 $ as $ 1+2+4 $ . Since we cannot represent $ 7 $ as the sum of four or more distinct positive integers, $ 3 $ is the answer. ### Constraints - $ N $ is an integer between $ 1 $ and $ 10^{18} $ , inclusive.