write a program to display greatest of three numbers

'8) write a program to display greatest of three numbers

x  = 10
y  = 15
z  = 20

If x>y And x>z Then
MsgBox "X is greater"
Else
If y>x And y>z Then
MsgBox "Y is greater"
Else
If z>x And z>y Then
MsgBox "Z is greater"
Else
MsgBox "all are equal"
End If
End If
End if