> #include<stdio.h>
> int main()
> {
>     double i=1;
> 	double len,sum=0;
> 	scanf("%lf",&len);
> 	if(len>=0.01&&len<=5.20)
> 	{
> 		while(sum<=len)
>            {
> 		i++;
> 		sum=sum+(1/i);
> 	    }
> 	printf("%d card(s)\n",(int)(i-1));
> 	}
> 	return 0;
> }