a frog is placed at the origin on the number line, and moves according to the following rule: in a given move, the frog advances to either the closest point with a greater integer coordinate that is a multiple of , or to the closest point with a greater integer coordinate that is a multiple of . a move sequence is a sequence of coordinates which correspond to valid moves, beginning with , and ending with . for example, is a move sequence. how many move sequences are possible for the frog?