#line 1 "main.cpp"
#include <iostream>
#include <string>

using namespace std;

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

    if (s.front() == '-') {
        cout << "0\n";
        return;
    }

    for (int q = 0; q < 2 && !s.empty(); ++q) s.pop_back();
    if (s.empty()) s.push_back('0');
    cout << s << "\n";
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}