#include <bits/stdc++.h>
#define FastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;

void solve() {
  string num;
  cin >> num;

  if (num[0] == '-' || num.size() <= 2) {
    cout << 0 << '\n';
  } else {
    for (size_t i = 0; i < num.size() - 2; i++) cout << num[i];
    cout << '\n';
  }
}

int main() {
  FastIO;
  solve();
  return 0;
}