#include <iostream>
using namespace std;

class CPU {
    public:
        int execute(int command, int data) {}
};

class Memory {
    public:
        int readData(int from) {}
        void saveData(int to) {}
};
 
class HardDrive {
    public:
        int readData(int from) {}
        void saveData(int to, int data) {}
};

class Computer {
    private:
        CPU cpu;
        Memory mem;
        HardDrive hd;
        
    public:
    void task1() {
        int data = mem.readData(1);
        data = cpu.execute(1, data);
        data = cpu.execute(2, data);
        hd.saveData(1, data);
    }
};


int main() {
    
    Computer pc;
    pc.task1();

    return 0;
}