poj1003

#include<stdio.h>
int main()
{
float length,n=0.0;
int j=1;
scanf("%f",&length);
while(length<=5.20&&length!=0.0)
{ 	j++;
n+=1.0/j;

if(n>=length)
{
printf("%d card(s)\n",j-1);
j=1;
n=0.0;
scanf("%f",&length);
}
}
return 0;
}