Pascal's Triangle Row Sum

Given a non-negative integer r, compute the sum of the elements in the r-th row of Pascal's Triangle. It is known that the sum of the elements in the r-th row is given by the formula:

\(2^r\)

Your task is to read the integer r from standard input and output the value of \(2^r\) as an integer to standard output.

Note: The input will consist of a single integer and the output should be exactly the computed result.

inputFormat

The input contains a single integer r on one line. The integer represents the row index in Pascal's Triangle.

Constraints: 0 ≤ r ≤ 20 (for the purpose of this problem).

outputFormat

Output a single integer, which is the sum of the elements in the r-th row of Pascal's Triangle. According to the formula, the result is \(2^r\).

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