/* -*- coding: utf-8 -*-
 *
 * 1415.cc:  No.1415 100の倍数かつ正整数(1) - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_L = 100;

/* typedef */

/* global variables */

char s[MAX_L + 4];

/* subroutines */

/* main */

int main() {
  scanf("%s", s);
  int l = strlen(s);

  if (s[0] == '-' || l < 3) puts("0");
  else {
    s[l - 2] = '\0';
    puts(s);
  }
  return 0;
}