#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

#define REP(i,n) for(int i=0;i<n;++i)
#define SORT(name) sort(name.begin(), name.end())
#define ZERO(p) memset(p, 0, sizeof(p))
#define MINUS(p) memset(p, -1, sizeof(p))

#define MOD 1000000007
#define INF 1000000000

string N;
int main()
{
    cin >> N;
    if(N == "0") {
        printf("0\n");
        return 0;
    }
    cout << N << "0" << endl;
    return 0;
}