#include <iostream>

namespace World{
    namespace Country{
        class Citizen {
            private:
                int number;
            public:
                Citizen(int _number): number(_number){};
                int getNumber(){
                    return this->number;
                };
        };
    }
}

int main(void){
    World::Country::Citizen john = World::Country::Citizen(12);
    std::cout << john.getNumber() << std::endl;

}