#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin >> s;
    int ss = s.size();
    if(s[0]!='-'){
        if(ss>=3){
            for(int i=0; i<ss-3; i++) cout << s[i];
            char ans = s[ss-3];
            cout << ans << endl;
        }
        else cout << 0 << endl;
    }
    else cout << 0 << endl;
}