#include <iostream>
#include <string>
using namespace std;

class InvalidArgumentException : public std::exception {
private:
    char* message;

public:
    InvalidArgumentException(char* msg) : message(msg) {}
    char* what () {
        return message;
    }
};
class Tovar {
private:
    string name;
    int cost, n;
public:
    Tovar() {
        name = "Plates";
        cost = 200;
        n = 4;
    };
    ~Tovar() {
    };
    Tovar(string name, int cost, int n) {
        setname(name);
        setcost(cost);
        setn(n);
    };
    double quality() {
        return cost/n;
    };
    void setname(string sname) {
        if (sname.length() == 0)
            throw InvalidArgumentException("Name can't be empty");
        name = sname;
    };
    void setcost(int scost) {
        if (scost <= 0)
            throw InvalidArgumentException("Cost must be more than 0");
        cost = scost;
    };
    void setn(int sn) {
        if (sn <= 0)
            throw InvalidArgumentException("n must be more than 0");
        n = sn;
    };
    string getname() const {
        return name;
    };
    int getcost() const {
        return cost;
    };
    int getn() const {
        return n;
    };
    string getInfo() {
        string res;
        res = "Наименование товара:" + name + "; " + "Цена:" + to_string(cost) + "; " + "Количество:" + to_string(n) + "; " + "Значение Q:" + to_string(quality());
        return res;
    };
};

class Year : Tovar {
private:
    int P, T = 2022;
public:
    Year() :Tovar() {
        P = 2018;
    };
    Year(string name, int cost, int n, int P) : Tovar(name, cost, n) {
        setP(P);
    };
    ~Year() {

    };
    void setP(int sP) {
        if (sP <= 0)
            throw InvalidArgumentException("P must be more than 0");
        P = sP;
    };
    int getP() {
        return P;
    };
    double quality1() {
        return quality()+0.5*(T-P);
    };
    string getInfo() {
        string res;
        res = "Наименование товара:" + getname() + "; " + "Цена:" + to_string(getcost()) + "; " + "Количество:" + to_string(getn()) + "; " + "Значение Q:" + to_string(quality1());
        return res;
    };
};

int main() {
    setlocale(LC_ALL, "RU");
    try {
        Tovar* obj1;
        obj1 = new Tovar("Folks", 100, 2);
        cout << obj1->getInfo() << "\n";
        Year* obj2;
        obj2 = new Year();
        obj2->setP(2017);
        cout << obj2->getInfo() << "\n";
    } catch (InvalidArgumentException e) {
        cout << e.what() << endl;
    }
}