zoj 2256 Mincost

#include<stdio.h>
int main(void)
{
    int kil;
    int flag=;
    double sum;
    while(scanf("%d",&kil)&&kil!=)
    {
        sum=;
        flag=;
        while(kil)
        {
            if(kil<=)
            {
                sum+=;
                kil-=kil;
            }
            else if(kil<=)
            {
                sum+=(kil-)*+;
                kil-=kil;
            }
            else if(kil<=)
            {
                flag=;
                sum+=+(kil-)*2.4;
                kil-=kil;
            }
            else
            {
                sum+=;
                kil-=;
            }
        }
        printf(flag==? "%.0lf\n":"%.1lf\n",sum);
    }
    return ;
}