//672 税

include[HTML_REMOVED]

include[HTML_REMOVED]

int main()
{
double s,t;
scanf(“%lf”,&s);
if(0<s&&s<2000.01) t=0;
else if(2000.00<s&&s<3000.01) t=(s-2000)0.08;
else if(3000.00<s&&s<4500.01) t=80+(s-3000)0.18;
else t=80+15000.18+(s-4500)0.28;
if(fabs(t)<=1e-6) printf(“Isento”);
else printf(“R$ %.2lf”,t);
return 0;
}