#include <iostream>
using namespace std;

class Complex
{
public:
    int r, i;
    Complex operator+(Complex c)
    {
        Complex t;
        t.r = r + c.r;
        t.i = i + c.i;
        return t;
    }
};

int main()
{
    Complex a, b, c;
    a.r = 2;
    a.i = 3;
    b.r = 4;
    b.i = 5;
    c = a + b;
    cout << c.r << " + " << c.i << "i" << endl;
    return 0;
}