Fill in a number in the box in the four-digit number 42□0 so that it can be divisible by 2, 3, and 5 at the same time. How many filling methods are there at most?
在四位数42□0中的方框里填一数字，使它能同时被2、3、5整除，最多有多少种填法．
<result>4</result>