JESS: SUM of slots

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JESS: SUM of slots

Nessrine Nassou
Hi all,
 �
How can i implement the SUM ( ∑ )  in jess? i have a template which contain persons, and for each person there is a slot "risk" , i want to calculate the SUM of all risks of all persons (∑ risk(i)   i: person i) 

Thanks for all,

Have a nice day.