> #include<stdio.h>
> int main(void)
> {   float i;
> 	while(scanf("%f",&i)==1)
> 	{
> 		float sum=0;
> 		int j=0,k=2;
> 		if(i==0.00)
> 		return 0;
> 	do 
> 	{sum+=(float)1/k;
> 	k++;
> 	j++;
> 	} while (sum<i);
> 	printf("%d card(s)\n",j);
> 	}
> 	return 0;
> }