from collections import defaultdict


def main():
    n = int(input())
    adj = defaultdict(list)
    for _ in range(n - 1):
        a, b = map(int, input().split())
        adj[a].append(b)
        adj[b].append(a)

    ans = 0
    for i in range(n + 1):
        ans += max(len(adj[i]) - 2, 0)
    print(ans)


if __name__ == "__main__":
    main()