import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0) == '-' || s.length() <= 2) {
            System.out.println(0);
        } else {
            System.out.println(s.substring(0, s.length() - 2));
        }
    }
}