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

v = [0] * N

for a,b in AB:
    a,b = a-1, b-1
    v[a] += 1
    v[b] += 1

ans = 0

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