#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  string S;
  cin>>S;
  if(S[0] == '-' || S.size() < 3) cout<<0<<endl;
  else{
      for(int i=0;i<S.size()-2;i++) cout<<S[i];
      cout<<endl;
  }
}