There are 15 questions in a certain mathematics competition, 5 points are awarded for each correct question, 1 point is deducted for each incorrect question, and 0 points are deducted for failing to do so. How many different scores can there be at most in this competition?
某次数学竞赛有15题，做对一题得5分，做错一题扣1分，不做得0分，这次竞赛最多有多少种不同的分数．
<result>51</result>