using namespace std;
10 int main(void)
11 {
12     double c;
13     int i;
14     double Overhangs;
15     while(scanf("%lf", &c) == 1)
16     {
17         if (0.0 == c)
18         {
19             return 0;
20         }
21         Overhangs = 0;
22         for (i=1; i; i++)
23         {
24             Overhangs += 1.0 / (i + 1);
25             if (Overhangs >= c)
26             {
27                 break;
28             }
29         }
30         printf("%d card(s)\n", i);
31     }