#include<stdio.h>
main()
{
      float length,l;
      int n;
     
      scanf("%f",&l);
      
      while(l!=0)
      {
            for(n=1,length=0;length<=l;n++)     
                 length=length+(1/(n+1));
            printf("%d card(s)",n-1);
                 
            scanf("%f",&l);     
      }
      
      getchar();
      
}