n = int(input())

a = []
b = []
for _ in range(n - 1):
    ai, bi = map(int, input().split())
    a.append(ai)
    b.append(bi)

count = [0] * (n + 1)
for i in range(n - 1):
    count[a[i]] += 1
    count[b[i]] += 1

ans = 0
for i in range(1, n + 1):
    if count[i] > 2:
        ans += count[i] - 2

print(ans)