#include<stdio.h>
int main()
{
    double salary, taxes, a1, a2;

    scanf("%lf", &salary);
    if (salary <= 2000)
        taxes = 0;
    else if (salary > 2000 && salary <= 3000)
    {
        a1 = (salary - 2000);
        taxes = (a1 * 8) / 100;
    }
    else if (salary > 3000 && salary <= 4500)
    {
        a1 = salary - 2000;
        a2 = a1 - 1000;
        a2 = (a2 * 18) / 100;
        taxes = (80 + a2);
    }

    else if (salary > 4500)
    {
        a1 = salary - 2000;
        a2 = a1 - 2500;
        a2 = (a2 * 28) / 100;
        taxes = (80 + 270 + a2);
    }

    if (taxes == 0)
        printf("Insento\n");
    else
        printf("R$ %.2lf\n", taxes);

    return 0;
}