#include <iostream>
#include <string>
#include <cmath>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <utility>
#include <functional>

using namespace std;

int main() {
	string s;
	cin >> s;

	if (s == "0") {
		cout << 0 << endl;
		return 0;
	}

	cout << s << 0 << endl;

	return 0;
}