1     #include <iostream>
 2     #include <cstdio>
 3     #include <cstring>
 4     using namespace std;
 5 
 6     int main()
 7     {
 8 
 9         double l;
10         while(~scanf("%lf",&l))
11         {
12             if(l==0.00) break;
13             int i=0;
14             double sum=0.0;
15             while(sum<l)
16             {
17                 i++;
18                 sum+=1.0/(i+1);
19             }
20             printf("%d card(s)\n",i);
21         }
22         return 0;
23     }