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Need help in the problem: Christmas Spruce.
CODE:-
n= int(input()) ls=[] for i in range(n): ls.append([])
for i in range(2,n+1): j=int(input()) ls[j-1].append(i)
for i in ls: for j in i: if ls[j-1]: i.remove(j)
ls = list(filter(([]).__ne__, ls))
if len(min(ls))<3: print('No') else: print('Yes')
