#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	string s;
	cin>>s;
	int i=0;
	for (i=0;i<s.length();i++){
		if (s[i]!='0'){
			cout<<s.c_str()<<"0"<<endl;
			return 0;
		}
	}
	cout<<"0"<<endl;
	
	return 0;
}