In archery, the ring number of each shot is 0 (missing the target) or a natural number from 1 to 10. Uncle Zhang and Uncle Li shot 5 arrows each, and the product of the rings of each of the 5 arrows is 1764, but the total number of rings of Uncle Zhang is 4 more than that of Uncle Li. How many rings does Uncle Zhang have in total?
在射箭运动中，每射一箭的环数是0(脱靶)或者是1～10的自然数．张叔叔和李叔叔各射了5箭，每人5箭的环数的积都是1764，但张叔叔的总环数比李叔叔的总环数多4环．张叔叔的总环数是多少环．
<result>28</result>