//No.552 十分簡単な星1の問題
#include<iostream>
#include<string>
using namespace std;

int main()
{
	string str;
	cin >> str;
	if (str == "0") {
		cout <<'0' << endl;
		return 0;
	}
	cout << str << '0' << endl;
	return 0;
}