1898 - Numbers Joke - PK@Contest.bjtu

1898.Numbers Joke

Time Limit: 1s Memory Limit: 256MB

Input Format(From the terminal/stdin)

The input contains a single integer a (1 \le a \le 30).

Output Format(To the terminal/stdout)

Output a single integer.

Sample Input

Copy

3
 \n

Sample Output

Copy

27
  \n

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