#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
	string S; cin >> S;
	if (S == "0") cout << "0" << endl;
	else cout << S << "0" << endl;

	return 0;
}