include [HTML_REMOVED]
using namespace std;
int main()
{
double a;
cin >> a;
if(a<=2000)
printf(“Isento”);
if(a<=3000&&a>=2000.1)
printf(“R$ %.2f”,(a-2000)*0.08);
if(a<=4500&&a>=3000.1)
printf(“R$ %.2f”,10000.08+(a-3000)0.18);
if(a>4500) printf(“R$ %.2f”,10000.08+15000.18+(a-4500)*0.28);
}