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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

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



}