UVa 10935 Throwing cards away I

#include<bits/stdc++.h>
#define ll long long

using namespace std;

int main()
{
 queue<ll>card;
 ll n,temp;
 
 while(cin>>n)
 {
  if(n==0) break;
  
  for(ll i=1;  i<=n; i++)
  {
   card.push(i);
  }
  cout<<"Discarded cards:";
  while(card.size() > 1)
  {
   cout<<" "<<card.front();
   card.pop();
   temp = card.front();
   card.pop();
   if(!card.empty())
   {
    cout<<",";
   }
   card.push(temp);
   
  }
  cout<<endl<<"Remaining card: "<<card.front()<<endl;
  card.pop();
 }
 
 return 0;
}