Forget the resistors for now, just look at each stage A-B, B-C, C-D, D-E, E-G individually and see what voltage appears across the capacitors after each pulse of input voltage. When you have worked out the voltages after several input pulses, follow the series connection of diodes and capacitors from A to G and see what total voltage is across them.
For now, assume the diodes are ideal and have no forward voltage drop or dynamic resistance. When you get to the A-G calculation you could then consider that the total would be somewhat less because of the drop across each PN junction.
Brian.