请问下面代码Fun((A), B)中的（A）括号是什么意思？

Option Explicit

Private Sub Command1_Click()
Dim A As Integer, B As Integer, K As Integer
A = 2: B = 4
K = Fun((A), B) + Fun(A, B)
Print K
End Sub
Private Function Fun(N As Integer, M As Integer) As Integer
Static K As Integer
N = N + M
K = K + N
M = M + K
Fun = N + M
Print Fun; N; M
End Function

a的值