File: a.elpi

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elpi 2.0.7-3
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type s num -> num.
type zero num.
pred ack i:num, i:num, o:num.
ack zero N V :- !, V = (s N).
ack M zero V :- !, (s M2) = M, ack M2 (s zero) V.
ack M N V :- (s M2) = M, (s N2) = N, ack M N2 V2, ack M2 V2 V.
main :- ack (s (s (s zero))) (s zero) V, print "V =" V.