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

int main(void){
    string n;
    cin >> n;
    int k = n.size();
    if(n[0]=='-'){
        cout << 0 << endl;
    }
    else{
        if(k<=2) cout << 0 << endl;
        else{
            rep(i,k-2) cout << n[i];
            cout << endl;
        }
    }
}