单选题
在窗体中有一个命令按钮Command1，编写事件代码如下：
Private Sub Command1_Click()
Dim s As Integer
s = p(1) + p(2) + p(3) + p(4)
debug.Print s
End Sub
Public Function p (N As Integer)
Dim Sum As Integer
Sum = 0
For i = 1 To N
Sum = Sum + 1
Next i
P = Sum
End Function
打开窗体运行后，单击命令按钮，输出的结果是