#include<stdio.h>
void main()
{
int i=2;
float n=0.0,m=1.0,b;
while(m!=0.0){
scanf("%f",&m);
if(m>5.20||m<0.01)
printf("\n");
else{
do
{
	b=(float)1/i;
	n=n+b;
    i++;
}while(n<=m);
printf("%d card(s)\n",i-2);
}
}
}