So we gonna find two integers and store them into two variable, so that we gonna use it further to add or subtract.
For Subtraction you can use
COUNT=`expr $value1 - $value2`
For Addition you can sue
COUNT=`expr $value1 + $value2`
Or you can use it
SUM=$(( $value1 + $value2 ));
SUB=$(( $value1 - $value2 ));
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