N = int(input())
G = [[]] * N
deg = [0] * N
for _ in range(N - 1):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    G[a].append(b)
    G[b].append(a)
    deg[a] += 1
    deg[b] += 1
ans = 0
for i in range(N):
    ans += max(deg[i] - 2, 0)
print(ans)