#include <iostream>
using namespace std;
int main(){
    string s;cin>>s;
    if(s[0] == '-' || s.size()<=2){
        cout << "0" << endl;
    }else{
        for(int i = 0; s.size()-2 > i; i++){
            cout << s[i];
        }
        cout << endl;
    }
}