#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) 
{
 long long N = 0; //整数型の入力値
 
 scanf("%lld",&N);
 if(0 == N)
 {
  printf("%lld\n",N*10);
 }
 else
 {
   printf("%lld0\n",N);
 }
 
 return 0;
}