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Problems

Bone for the Sharik

Bone for the Sharik

\textit{--- Pechkin you will ever think?} \textit{--- Why do I think? Let your Burenka thinks - her head is big ...} \includegraphics{https://static.e-olymp.com/content/95/9574936871dbf97f93e4a044050fbdf19d602894.jpg} \textit{--- Matroskin, what are you out there think?} \textit{--- Why, I can not calculate how much you owe Sharik seed yield ... You had promised him a reward royally: the first cell of a chessboard the size N x N single bone, the second - two - the third four, and so on, so e. for each next cell twice. So I think what you have to seed Sharik bring ...} Help Matroskin count how many seeds should bring Pechkin. Прослухати Читати фонетично \InputFile One number - the size of the chessboard \textbf{N} (\textbf{1} ≤ \textbf{N} ≤ \textbf{100}). \OutputFile Single number - the required amount of seed.
Time limit 1 second
Memory limit 64 MiB
Input example #1
3
Output example #1
511