Hexa Slovak Sums (455)

Place digits from 1 to N (N will be given, in the example the N is 2) into some empty hexagonal cells, so that each row contains each digit exactly once (in every of the three directions). Clue numbers indicate the sum of orthogonally adjacent digits. The number of circles under a clue number indicates the number of digits involved in this sum.

Reference: WPC 2016 (65)