#include<stdio.h>
main()
{
//
float c;
while( scanf("%f", &c) &&c != 0)
{
int i = 2;
float fResult = 0;
while( fResult < c)
{
fResult = fResult + 1.00/i;
i++;
}
//
printf("%d card(s)\n", i - 2);
}
}
main()
{
//
float c;
while( scanf("%f", &c) &&c != 0)
{
int i = 2;
float fResult = 0;
while( fResult < c)
{
fResult = fResult + 1.00/i;
i++;
}
//
printf("%d card(s)\n", i - 2);
}
}