11185 - Ternary

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long int num,a[100],r,i;
    while(cin>>num && (num>=0))
  {
      i=0;
      if(num==0)
        cout<<"0";

            while(num>0){
                a[i++]=num%3;
                num/=3;
            }
    for(long long int j=i-1;j>=0;j--)
        cout<<a[j];
    cout<<"\n";
    }

    return 0;
}