# 次数が2を超える数の合計でいいのか?

N = int(input())
edges = [[] for i in range(N+1)]
degree = [0]*(N+1)
for i in range(N-1):
    a, b = map(int, input().split())
    edges[a].append(b)
    edges[b].append(a)
    degree[a] += 1
    degree[b] += 1

ans = 0
for i in range(1, N+1):
    ans += max(0, degree[i]-2)
print(ans)