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#include<stdio.h>
void main()
{
float road,money,money1=0,money2=0;
int time;
scanf("%f %d",&road,&time);
if((road>0||time>0)&&road<=2&&time<=10)
{
money=6;
}
else
{
if(road>2)
{
money1=6+0.7*((int)road-2)/0.5;
if(road>7)
{
money1=money1+0.7*((int)road-7);
}
}
if(time>10)
{
money2=6+1.4*((int)((time-10)/3));
}
(money1>=money2)?(money=money1):(money=money2);
}
printf("%.1f\n ",money);
system("pause");
return 0;
}