N = int(input())
G = [list() for _ in range(N)]
jisu = [0]*N
for i in range(N - 1):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    G[u].append(v)
    G[v].append(u)
    jisu[u] += 1
    jisu[v] += 1

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