POJ1003 Hangover

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    double n;
    while(scanf("%lf",&n)!=EOF)
    {
        if(n==0.00)
            break;
        double ans=0;
        int i,j;
        for(i=2,j=1;;i++,j++)
        {
            ans+=1.0/i;
            if(ans>n)
                break;
        }
        printf("%d card(s)\n",j--);
    }
    return 0;
}