zoj 2256 Mincost

#include<stdio.h>

int main(void)

{

    int kil;

    int flag=0;

    double sum;

    while(scanf("%d",&kil)&&kil!=0)

    {

        sum=0;

        flag=0;

        while(kil)

        {

            if(kil<=4)

            {

                sum+=10;

                kil-=kil;

            }

            else if(kil<=8)

            {

                sum+=(kil-4)*2+10;

                kil-=kil;

            }

            else if(kil<=12)

            {

                flag=1;

                sum+=18+(kil-8)*2.4;

                kil-=kil;

            }

            else

            {

                sum+=18;

                kil-=8;

            }

        }

        printf(flag==0? "%.0lf\n":"%.1lf\n",sum);

    }

    return 0;

}