/**
*    author:  shu8Cream
*    created: 05.03.2021 21:19:41
**/

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i=0; i<(n); i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using P = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string n;
    cin >> n;
    if(n[0]=='-'){
        cout << 0 << endl;
        return 0;
    }else{
        if(n.size()<3) cout << 0 << endl;
        else{
            n.pop_back();
            n.pop_back();
            cout << n << endl;
        }
    }
}