#include <iostream>
#include <string>
using namespace std;

int main(){
    string n;
    cin >> n;
    if(n[0] == '-' || n.length() < 3) cout << 0 << endl;
    else{
        for(int i = 0; i+2 < n.length(); i++) cout << n[i];
        cout << endl;
    }
    return 0;
}