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

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