#include <iostream>
using namespace std;

class Num
{
public:
    int x;
    Num operator+(Num n)
    {
        Num t;
        t.x = x + n.x;
        return t;
    }
};

int main()
{
    Num a, b, c;
    a.x = 10;
    b.x = 20;
    c = a + b;
    cout << "Sum: " << c.x << endl;
    return 0;
}