Valera take Berland Marathon the marathon race start stadium represent plane square low left corner locate point coordinate 00 length equal meter the side square parallel coordinate axesAs length marathon race long Valera need extra drink race the coach give Valera bottle drink d meter path we know Valera start point coordinate 00 run counterclockwise that Valera cover meter reach point coordinate a0 we know length marathon race equal nd05 meter help valeras coach determine locate help Valera specifically determine coordinate Valeras position cover d2dnd meter