#include <bits/stdc++.h>
using namespace std;

using ll=long long;
ll mod=1000000007;
ll INF=1LL<<60;

int main() {
	string S;
	cin >> S;
	if(S[0]=='-' || S.size()<=2){
		cout << 0 << endl;
		return 0;
	}
	cout << S.substr(0,S.size()-2) << endl;
}