Dec

Decrements a variable or attribute by the value of a specified numeric expression. When keeping track of the total number of entities an activity is simultaneously processing, increment a variable at the beginning of the logic and decrement it at the end.

Components

Attribute/Variable The name of a variable or attribute you have previously defined.
(Value) The amount to decrement the value. If this expression is omitted, the value will be decremented by one. This can be a negative number.