Change from one value to another

Make a button that changes values in order after pressing the button and giving a button values 34, 34 and 32 after completing each value, the other number appears to us

Init a global variable with the list
34
34
32

Show the value at item 1 in the button.text

When button click
Add item 1 to end of list (fourth item)
Remove item 1
Show the new first one again.