n = int(input())
connect_list = [0 for i in range(n)]
for i in range(n-1):
	a, b = [ int(v) for v in input().split() ]
	connect_list[a-1] += 1
	connect_list[b-1] += 1


s = 0
for i in connect_list:
	if i >= 2:
		s += i - 2
print(s)