How can I subtract in formcalc sum(amount[0],amount[1],amount[2])

[MikeO-YiUi4O]

How can I subtract amount[3] from this sum?  sum(amount[0],amount[1],amount[2])

[dcidev]

sum(amount[0], amount[1], amount[2]) - amount[3]

Kyle

[MikeO-YiUi4O]

ThanK You that worked like a champ.