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Input

The input contains a single integer a (0 ≤ a ≤ 15).

Output

Output a single integer.

Example

Input


3


Output


13
val = int('{:04b}'.format(int(input()))[::-1], 2) - 1
if val < 0:
    val = 16 + val

print(int('{:04b}'.format(val)[::-1], 2))