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 PYTHON3):

Solution:
a = int(input())
rev = lambda x: int(''.join(reversed(bin(x)[2:].zfill(4))), 2)
print(rev(rev(a) - 1) if a else 15)