i=1:j=100:Key=20
Do While i<=j
a = i+(j- i)\4: b= i+(j- i)\ 2:c=j-(j-i)\4
If a=Key Or b=Key Or c=Key Then ExitD o
If i<= Key And Key< a Then j= a- 1: w= w+ 1
If a< Key And Key < b Theni = a+ 1: j= b-1:x=x+1
If b < Key And Key < c Then i= b+1:j=c-l:y=y+1
If c<Key And Key<=j Then i=c+1:z=z+1
Loop
n=w+x+y+z
程序运行结束后,变量n的值是( )