clpfd:sum/3

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Predicate sum/3

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library
- clp

sum(+Vars, +Rel, ?Expr)

The sum of elements of the list Vars is in relation Rel to Expr. Rel is one of #=, #\=, #<, #>, #=< or #>=. For example:

?- [A,B,C] ins 0..sup, sum([A,B,C], #=, 100).
A in 0..100,
A+B+C#=100,
B in 0..100,
C in 0..100.