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

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