<image>As shown in the figure, the vertices of a regular pentagon are numbered consecutively as 1, 2, 3, 4, 5. If starting from a certain vertex and walking along the edges of the pentagon in a clockwise direction, the number of the vertex determines the number of edges to walk, this method of movement is called a "shift". For example, if Xiaoyu is on the vertex numbered 3, then he should walk 3 edges, i.e., move from 3→4→5→1 for the first "shift", reaching the vertex numbered 1; then from 1→2 for the second "shift". If Xiaoyu starts from the vertex numbered 2, the number of the vertex he will be at after the 15th "shift" is ______.