/*
*POJ 1003
*sxr
*2020.1.12
*/
#include <iostream>
using namespace std;
int fun(double sum)
{
int n=1;
double curSum=0.0;
while (curSum < sum)
{
n++;
curSum += (1.0/n); //注意类型转换为double
}
return n-1;
}
int main(void)
{
double sum;
while(true)
{
cin >> sum;
if (sum<0.01 || sum>5.20)
break;
int a = fun(sum);
cout << a << " card(s)" << endl;
}
return 0;
}