class Complex {
    private final double x, y;
  
    Complex(double x, double y) {
        this.x = x;
        this.y = y;
    }

    double getX() {
        return x;
    }
  
    double getY() {
        return y;
    }
}
class Use {
    void test(Complex c) {
        System.out.println(Math.hypot(c.getX(), c.getY()));
    }
}