N = int(input())
UV = [list(map(int, input().split())) for _ in range(N - 1)]
D = [0] * (N + 1)
for u, v in UV:
    D[u] += 1
    D[v] += 1
ans = 0
for i in range(1, N + 1):
    ans += max(D[i] - 2, 0)
print(ans)