窗体上有两个Command1、Command2命令按钮,现在有以下程序: Option Base 0 Dim a( ) As Integer, m As Integer Private Sub Command1_Click() m = InputBox("请输入一个正整数") ReDim a(m) End Sub Private Sub Command2_Click() m = InputBox("请输入一个正整数") ReDim a(m) End Sub 运行,单击Command1后输入整数5,再单击Command2后输入整数10,则数组a中元素的个数是( )