HDU 1056 HangOver

#include <stdio.h>int main(int argc, char *argv[]){    int i;    double n,sum;    while(scanf("%lf",&n)!=EOF)    {        if(n==0) break;        for(i=2,sum=0; sum<n; i++)            sum+=1.0/i;        printf("%d card(s)\n",i-2);    }    return 0;}