#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;

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

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

  return 0;
}