#include <stdio.h>
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
double len;//Length
while(cin>>len&&len!=0)
{
int s=0;//累加和
double l=0;//出边和
while(l<len)
{
l+=(double)1/(double)(s+2);
++s;
}
cout<<s<<" card(s)"<<endl;
}
return 0;
}