[填空题] 设有以下函数过程： Functio fun(m As Integer) As Integer Dim k As Integer， sum As Integer sum=0 For k

[填空题] 设有以下函数过程： Functio fun(m As Integer) As Integer Dim k As Integer， sum As Integer sum=0 For k=m To 1 Step -2 sum = sum+ k Next k fun=sum End Function 若在程序中用语句s=fun(10)调用此函数，则s的值为 ______。