<image>The regular pentagon shown in the figure is a checkerboard for a jumping game. The game rules are as follows: the vertices of the regular pentagon are numbered 1, 2, 3, 4, 5 sequentially. If you start from a certain vertex and move in the clockwise direction along the sides of the pentagon, and the number of the vertex represents the number of side lengths you move, this is called a "shift". For example, if Xiaoming is at the vertex numbered 3, he should move 3 side lengths, that is, from 3→4→5→1 for the first "shift", and he will reach the vertex numbered 1; then from 1→2 for the second "shift". If Xiaoyu starts from the vertex numbered 1, the vertex number he will be at after the 9th "shift" is ___. 
