zoj 1045 HangOver

#include "iostream"
using namespace std;

int main()
{
double num;
while (cin >> num && num)
{
double sum = 0;
double count = 0, n = 2;
while (1)
{
if (sum > num) break;
sum += 1/n;
count++;
n++;
}
cout << count << " card(s)" << endl;
}
}