> #include <stdio.h>
> #include <math.h>
> int main()
> {
> 	float c,sum;
>     int n;
> 	scanf("%f",&c);
> 	
>     while ((c>=0.01)&&(c<=5.20)){	
> 		sum=0;
> 		for(n=2;sum<c;n++){
> 			sum+=(float)1/n;
> 		}
>     printf("%d card(s)\n",n-2);
>     scanf("%d",&c);
> 	}
> 	
> }