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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
def main():
    a = '{0:b}'.format(int(input())).rjust(4, '0')
    a = ''.join(reversed(a))
    a = int(a, 2)
    if a > 0:
        a -= 1
    else:
        a = 15
    a = '{0:b}'.format(a).rjust(4, '0')
    a = ''.join(reversed(a))
    print(int(a, 2))


if __name__ == '__main__':
    main()