N = int(input())

D = [0 for _ in range(N)]
for _ in range(N - 1):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    D[a] += 1
    D[b] += 1

res = 0
for d in D:
    res += max(d - 2, 0)

print(res)