string id=""
cnt=1
start=2
for i= 2~2000
a="" exit for loop
if id==a{
cnt++
}else{
//抓到尾
if cnt <=12
set page=3inch
else if cnt < 26
set page=6inch
else if cnt < 40
set page=9inch
else if cnt < 54
set page=12inch
else if cnt < 68
set page=15inch
else if cnt < 82
set page=18inch
else