Answer:
Use %eval to do simple calculation for macro variables.
e.g.,
data _null_;
%let a = 1;
%let b = %eval(&a+1);
%put a=&a b=&b;
run;
e.g.,
data _null_;
%let a = 1;
%let b = %eval(&a+1);
%put a=&a b=&b;
run;
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