#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    string S;
    cin >> S;

    if (S[0] == '-') {
        cout << 0 << endl;
    } else if (S.size() <= 2) {
        cout << 0 << endl;
    } else {
        rep(i, S.size() - 2) cout << S[i];
        cout << endl;
    }

    return 0;
}