> #include<stdio.h>
> int main()
> {
>      float length;
>      float in;
>      int num=0;
>      
>      
>      while(scanf("%f",&in))
>      {
>          if(in==0.00) break;
>          int count=0;
>          float sum=0.00;
>          for(count=1;count<1000;count++)
>          {
>            sum=sum+1.00/(count+1);  
>            
>            if(sum>=in)break;          
>          }                  
>           printf("%d card(s)\n",count);
>      }
>      return 0;
>          
> }