#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)
const ll INF = 1e9;

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