有如下程序：Private Sub Command1_Click() Dim i As Integer， j As Integer Dim sum As Integer n＝1 Do j＝1 Do sum＝sum＋j j＝j＋1 Print j； Loop Until j>3 n＝n＋2 Loop Until n>10 Print sumEnd Sub运行上述程序，外层Do循环执行的次数为( )。