"""

https://yukicoder.me/problems/no/806

葉の数-2 ?

"""

N = int(input())

inlis = [0] * N

for i in range(N-1):
    u,v = map(int,input().split())
    u -= 1
    v -= 1
    inlis[u] += 1
    inlis[v] += 1

print ( inlis.count(1) - 2 )