Basic Lift Circuit

This is Basic Lift circuit. When the P1 push button press lift working floor 1 - 2. And it continues automatically for other floors small time duration in each floor. after reach 4th floor, lift automatically come back to 1st floor.
We can do this mannually by usin P2, P3, P4, P5, P6 push buttons.
 P2 - 4 th floor to 3rd floor
P3 -  3 rd floor to 4 th floor
P4 -  2 nd floor to 3 rd floor
P5 -  3 rd fllor to 2 nd floor
P6 - 2nd floor to 1 st floor