#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)

int main(){
  string s;
  cin>>s;
  if(s[s.size()-1]=='0'&&s[s.size()-2]=='0'&&s[0]!='-'){
    rep(i,s.size()-2){
      cout<<s[i];
    }
    cout<<endl;
  }else{
    cout<<0<<endl;
  }
  return 0;
}