POJ1003 Hangover

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <queue>
#include <algorithm>
#include <cmath>

using namespace std;

int cmp(double x, double y) {
if(x-y<0) return -1;
else return 1;
}

int main() {
double n;

while(cin >> n) {
if(n == 0) break;
int item = 2;
double sum = 0;

while(cmp(sum, n) == -1) {
sum += 1.0/item;
item++;
}

printf("%d card(s)\n", item-2);
}

return 0;
}