Problem: 

Input

The input contains a single integer a (0 ≤ a ≤ 35).

Output

Output a single integer.

Examples

Input

3


Output

8


Input

10


Output

1024

Solution (in PYTHON):

Solution:
print([15,14,12,13,8,9,10,11,0,1,2,3,4,5,6,7][int(raw_input())])