1 var 1 enable
2 var 1 reset
3 var 4 count
4 redand 1 3
5 root 1 4
6 var 4 input
7 add 4 3 6
8 cond 4 1 7 3
9 zero 4
10 cond 4 2 9 8
11 next 4 3 10