When a is divided by 5, the remainder is 1, and when b is divided by 5, the remainder is 4. If 3a>b, then what is the remainder when 3a-b is divided by 5?
a除以5余1，b除以5余4，如果3a＞b，那么3a-b除以5余数是多少．
<result>4</result>