N = int(input())
ab = [list(map(int, input().split())) for _ in range(N-1)]

cnt = [0] *N
for i in range(N-1):
    a, b = ab[i]
    a -= 1
    b -= 1
    cnt[a] += 1
    cnt[b] += 1

ans = 0
for i in range(N):
    ans += max(cnt[i] - 2, 0)
print(ans)