#include <iostream>
#include <algorithm>
#include <string>
#include <cstdio>
#include <cmath>
#include <stack>
#include <cstring>
#include <vector>
#include <set>
#include <map>
#include <queue>




int main()
{
	std::string n;

	std::cin >> n;

	if (n == "0") {
		std::cout << 0 << std::endl;
		return 0;
	}

	std::cout << n << "0" << std::endl;



	return 0;
}