from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

S = list(input())[:-1]

if S[0]=='x':
    val = int(''.join(S[1:]))
    print(2**32 - val)
else:
    val = int(''.join(S[0:]))
    print(val)