#include <iostream>
#include <vector>
#include <map>
#include<string>
#include<algorithm>
#include<math.h>
#define ll long long
#define P pair<int,int>
#define lP pait<ll,ll>
using namespace std;
int main() {
    string s;
    cin>>s;
    if(s=="0") cout<<0<<endl;
    else {
    s.push_back('0');
    cout<<s<<endl;
    }
    return 0;
}