PROC REPORT with Cumulative counts

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I'm trying to use PROC report to manipulate a dataset where I counted how many patients were abstinent from smoking for a certain number of 'months' (derived from dividing days by 30) . However, I also need to add a column where I find out how many patients were not abstinent from smoking (by subtracting the cumulative total of abstinent patients from the total amount of patients, 234).

I added a 'tmp' variable and initialized it to 0 b/c I know it resets the count, but either I've been staring at this too long or my brain's fried b/c I'm blanking on how to get my desired column:

data imp55a;
	set ch4.imp55;
	Days_new=input(put(Day_abs,dayssmoke.),3.);
	Days_newish=ceil(Day_abs/30);
	
proc report data=imp55a;
	column Days_newish ID new n;
	define Days_newish / group 'Month Resumed';
	define ID / analysis n 'Not abstinent';
	define n / 'Count';
	define new / computed 'Remaining abstinent';
	compute before Days_newish;
	tmp=0;
	endcomp;
	compute new;
	new=234+-1*n;
	endcomp;

Thank you guys for your kindness & support---I appreciate it so much!

[Kurt_Bremser]

To see what your code really does, we also ned to see the PROC FORMAT for dayssmoke.

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proc format;
	value dayssmoke 
	0-30 ='1' 
	31-60='2'
	61-90 ='3' 
	91-120='4'
	121-150 ='5' 
	151-180='6'
	181-210 ='7' 
	211-240='8'
	241-270 ='9' 
	271-300='10'
	301-330 ='11' 
	331-365='12'
	;
run;

Thank you for your input; I didn't include it because I used the alternative (ceiling/division).

[Kurt_Bremser · Accepted solution]

A computed column can only use variables that have been named before them in the COLUMN statement, so new can't use n as that comes later.

I moved n before new and made it noprint, as it is redundant (same values as not abstinent):

proc report data=imp55a;
column Days_newish ID n new;
define Days_newish / group 'Month Resumed';
define ID / analysis n 'Not abstinent';
define n / noprint;
define new / computed 'Remaining abstinent';
compute before;
all = 234;
endcomp;
compute new;
new = all - n;
endcomp;
compute after days_newish;
all = all - n;
endcomp;
run;

Result:

Month Resumed	Not abstinent	Remaining abstinent
0	13	221
1	139	82
2	18	64
3	10	54
4	3	51
5	5	46
6	3	43
7	2	41
8	2	39
9	3	36
11	2	34
12	1	33
13	33	0

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Thank you so much for your help; I appreciate it so much!!! The code worked after I corrected the incorrect order and the incorrect usage of computation variables.