from collections import deque, defaultdict

N = int(input())
adj = defaultdict(list)
degs = [0] * N
for _ in range(N-1):
    a, b = map(lambda x: int(x)-1, input().split())
    adj[a].append(b)
    adj[b].append(a)
    degs[a] += 1
    degs[b] += 1

ans = 0
for i in range(N):
    if degs[i] > 2:
        ans += degs[i] - 2

print(ans)