#include<bits/stdc++.h> 
using namespace std;

int main(){
  string s;
  cin>>s;
  if(s[0]=='-'||s.size()<3){
    cout<<"0\n";
  }else{
    string ret="";
    for(int i=0;i<s.size()-2;i++){
      ret+=s[i];
    }
    cout<<ret<<'\n';
  }
}