computer user plans to spend no more than 500 yuan to purchase single-chip software and boxed disks with a unit price of 60 yuan and 70 yuan. According to the needs, at least 3 pieces of software and at least 2 boxes of disks. There are several different purchase methods for this user ?
某电脑用户计划用不超过500元的资金，购买单价为60元和70元的单片软件和盒装磁盘，根据需要软件至少3片，磁盘至少2盒，该用户不同的购买方式有几种？
<result>7</result>