n = int(input())
G = []
for i in range(n):
    G.append(set())
for i in range(n-1):
    a,b = [int(x) -1 for x in input().split()]
    G[a].add(b)
    G[b].add(a)
more_than_two = 0
t_s = 0
for i in range(n):
    if len(G[i]) > 2:
        t_s += len(G[i])
        more_than_two +=1
print(t_s - more_than_two * 2)