Given polygon of 2013 sides A1 A2 ... A2013().

Numbers are placed on the vertices of the polygon sothat the sum of the numbers on any 9 consecutive vertices alwaysequals a constant number whose value is 300.

If you know that the number you put in thevertexis A13 () is 13,

And the number placed at the vertex A20 () is 20.

What number is placed at the vertex A2013 ( ).

with explain.

ĄĄ...Ą 2013 A 13 А. 20 A. 2013