#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){

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

    return 0;
}