n=int(input())
e=[[] for i in range(n)]
for i in range(n-1):
	a,b=map(int,input().split())
	a-=1
	b-=1
	e[a]+=[b]
	e[b]+=[a]
v=[0]*n
f=[1]*n
q=[0]
while len(q)>0:
	s=q[-1]
	if v[s]==0:
		v[s]=1
		for t in e[s]:
			if v[t]==0:
				q+=[t]
				f[t]=0
	else:
		q.pop()
print(sum(f)+(len(e[0])==0)-2)