#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = std::int_fast64_t;
using std::cout;
using std::cerr;
using std::endl;
using std::cin;

template<typename T> std::vector<T> make_v(size_t a){return std::vector<T>(a);}
template<typename T, typename... Ts> auto make_v(size_t a, Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

int main() {
	std::string s; cin >> s;

	if(s.front() == '-' or s.size() <= 2) {
		printf("0\n");
	} else {
		printf("%s\n", s.substr(0, s.size() - 2).c_str());
	}
	return 0;
}