#include <stdio.h>

int main () {
  char s[12] = "";
  
  int res = 0;
  
  int idx = 0;
  long long ans = 0LL;
  int is_x = 0;
  
  res = scanf("%s", s);
  
  if (s[0] == 'x') {
    is_x = 1;
    idx++;
  }
  
  while (s[idx] != '\0') {
    ans *= 10LL;
    ans += (long long)(s[idx]-'0');
    idx++;
  }
  
  if (is_x > 0) {
    ans = (1LL<<32)-ans;
  }
  
  printf("%lld\n", ans);
  return 0;
}