#include "bits/stdc++.h"

using namespace std;
using ll = long long;
using IP = pair<int, int>;


#define INF 999999999
#define atcoder(int)1e9+7
#define Endl endl

int main() {

	string s;
	cin >> s;
	if(s != "0")
               cout << s <<'0' << endl;
	else cout << s << endl;


	return 0;
}