import sys
from collections import deque, Counter
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

s = input()

if s[0] == 'x':
    print(2 ** 32 - int(s[1:]))
else:
    print(int(s))