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0 to 255 binary counter

A small simple bianary counter that uses cannon balls as the counter.
Press 1 to add 1.
To read the counter simply add all the numbers pointed to:

1=1
2=2
3=4
4=8
5=16
6=32
7=64
8=128

The math problem to solve this is:
x = unit pointed twards
y = the value of unit
2^(x-1)=y