Prolog binary tree node value count -

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Can anyone help me in Prolog How can the plant be realized that all the node numbers of the binary tree count goes?

For example: 

  tree 1 (tree (1, tree (2, tree (3, zero, zero), tree (4, zero, zero)) , Tree (5, tree (6, zero, zero), tree (7, zero, zero)).   
 will return 28. Can anybody help?   
 
 
 Tail-recursive  not  short resuscitation.  
 < Tree> tree (zero, 0) tree (tree (X, T1, T2), S): - Perum (T1, S1), tree (T2, S2), SX + S1 + S 2.

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