#include <iostream>

// Your code here

int main()
{
    //Test 1
    Node a = Negate{Number{10}};
    std::cout << a.evaluate() << std::endl;

    //Test 2
    Node b = Sum{Negate{Number{3}},
                 Number{5}};
    std::cout << b.evaluate() << std::endl;

    //Test 3
    Node c = Negate{Sum{Negate{Number{5}},
                        Sum{Number{3},
                            Negate{Number{1}}}}};
    std::cout << c.evaluate() << std::endl;
}