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BALKAN-SL 2014 C2

    Let M={1,2,...,2013}M=\{1,2,...,2013\} and let Γ\Gamma be a circle. For every nonempty subset BB of the set MM , denote by S(B)S(B) sum of elements of the set BB , and define S(∅)=0S(\varnothing)=0 ( ∅\varnothing is the empty set ). Is it possible to join every subset BB of MM with some point AA on the circle Γ\Gamma so that following conditions are fulfilled: 11 . Different subsets are joined with different points; 22 . All joined points are vertices of a regular polygon; 33 . If A1,A2,...,AkA_1,A_2,...,A_k are some of the joined points, k>2k>2 , such that A1A2...AkA_1A_2...A_k is a regular k−gonk-gon , then 20142014 divides S(B1)+S(B2)+...+S(Bk)S(B_1)+S(B_2)+...+S(B_k) ?

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