#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	string s;
	cin>>s;
	
	if(s[0]=='-')cout<<0<<endl;
	else{
		if(s.size()<=2)cout<<0<<endl;
		else{
			s.pop_back();
			s.pop_back();
			cout<<s<<endl;
		}
	}
	
    return 0;
}