i=1: flag=True
Do While i<6 And flag=True
flag=False
For j =6 To i+1 step -1
If a(j) > a(j-1) Then
t = a(j): a(j) = a(j-1): a(j-1) = t
flag=True
End If
Next j
f(i)=1 'f 数组初值均为 0
i=i+1
Loop
For i=1 To 6
s=s+f(i)
Next i
数组元素a(1)到a(6)的值依次为“17,79,93,55,15,13”,执行该程序段后,s的值是( )