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Problem
Given an integer N, print 2 raised to the power of N using a predefined function.
Input format
Input
input.txt
A single integer N (0 <= N <= 10).
Output format
Output
output.txt
2 to the power of N.
Example
input
3
output
8
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Sample cases (from the problem)
Sample Case 1
Input
3
Expected output
8
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