#include <iostream>
int main() {
int prendas_vendidas;
int sueldo_base = 800;
int bonificacion;
std::cin >> prendas_vendidas;
if (prendas_vendidas >= 3 && prendas_vendidas <= 8) {
bonificacion = prendas_vendidas * 25;
} else if (prendas_vendidas >= 9 && prendas_vendidas <= 12) {
bonificacion = prendas_vendidas * 45;
} else if (prendas_vendidas >= 13 && prendas_vendidas <= 18) {
bonificacion = prendas_vendidas * 70;
}
int sueldo_total = sueldo_base + bonificacion;
std::cout << sueldo_total;
return 0;
}
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