I need help finding the impedance of the circuit below. How do I calculate it mathematically and if there is way to find it directly in ltspice please let me know. I'll appreciate any help.

 

If you were to replace C1, C2, and C3 with resistors would you know how to calculate the impedance of the circuit?

 

V1 is shown as a DC voltage so the impedance at DC is the value of R1.
If V1 is AC then its frequency determines the circuit's impedance.