Recently I try to calculate simple circuit:

First I calculated resistances on the right corner

1/((1/1)+(1/3)) = rx1

then

1/((1/rx1)+(1/2)) = rx2

then

1/((1/rx2)+(1/1.5)) = rx3

then

1+rx3+1 = rxfinal

I enden up with 2.4

but according to this programm total resistance must be: 2970,29703ohm

(V/I)

I want to know where did I go wrong in my calculations?