#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); ++i)

int main() {
  string s;
  cin >> s;
  if (s.front() == '-') { cout << 0 << endl; }
  else if (s.size() < 3) { cout << 0 << endl; }
  else {
    s.pop_back(), s.pop_back();
    cout << s << endl;
  }
  return 0;
}