//g++ 5.cpp -std=c++14 -I .
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;
#define fi first
#define se second
#define pb push_back

int main(){
  string s;
  cin>>s;
  if(s[0]=='-'){
    cout<<0<<endl;
    return 0;
  }
  if(s.size()<3){
    cout<<0<<endl;
    return 0;
  }
  for(int i=0;i<s.size()-2;i++){
    cout<<s[i];
  }
  cout<<endl;
}