Tính tổng

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Points: 5.00 (partial)
Time limit: 1.0s
Memory limit: 1G
Input: stdin
Output: stdout

Author:
Problem type
Allowed languages
C, C++, GAS64, Pascal, Perl, PHP, Python, Sed, TCL, Text

Cho số ~n~ hãy tính ~S = 1 + 2 + 4 + 8 + 16 + 32 + ... + n~ (với ~n <= 31~)

Input: ~n~

Output: Đưa ra tổng ~S~

Ví dụ:
Input
8
Output
15

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