a(1) = 1: a(2) = 1
b(1) = 1: b(2) = 2
For i = 3 To 5
a(i) = a(i - 1) + a(i - 2)
b(i) = b(i - 1) + a(i)
Next i
执行该程序段后,数组元素b(5)的值为( )