/* -*- coding: utf-8 -*-
 *
 * 2224.cc:  No.2224 UFO Game - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<algorithm>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  char s[16];
  scanf("%s", s);

  if (s[0] == 'x') {
    s[0] = '-';
    printf("%u\n", (unsigned)atoi(s));
  }
  else
    puts(s);

  return 0;
}