> #include<stdio.h>
> int main()
> {
>    int j,k,n,m;
>    double f,s,i;
>    while(scanf("%lf",&f)==1&&f!=0.0)
>    {
>        s=0.0;
>        for(i=2,j=0;s<f;i++,j++)
>        {
>            s+=1/i;
>        }
>        printf("%d card(s)\n",j);
>    }
>    return 0;
> }