#include <iostream>
class memoly {
    private:
    int cost;
    public:
    memoly(){
        this->cost = 0;
    }
    void REmemoly(int cost){
        this->cost = cost;
    }
    int GETmemoly(){
        return this->cost;
    }
}

int main() {
    std::cout << "Hello world!" << std::endl;
    return 0;
}