mod = 998244353


def main():
    import sys
    from collections import deque
    from heapq import heappush, heappop
    input = sys.stdin.buffer.readline

    N = int(input())
    adj = [[] for _ in range(N+1)]
    for _ in range(N-1):
        a, b = map(int, input().split())
        adj[a].append(b)
        adj[b].append(a)

    que = deque()
    que.append(1)
    seen = [-1] * (N+1)
    seen[1] = 0
    par = [0] * (N+1)
    child = [[] for _ in range(N+1)]
    seq = []
    while que:
        v = que.popleft()
        seq.append(v)
        for u in adj[v]:
            if seen[u] == -1:
                seen[u] = seen[v] + 1
                par[u] = v
                child[v].append(u)
                que.append(u)
    seq.reverse()

    size = [1] * (N + 1)
    for v in seq:
        for u in child[v]:
            size[v] += size[u]

    pq_list = [[] for _ in range(N+1)]
    adj_new = [[] for _ in range(N+1)]
    for v in seq:
        if not child[v]:
            continue
        for u in child[v]:
            heappush(pq_list[v], (-size[u], u))
        # merge
        for u in child[v]:
            if len(pq_list[v]) < len(pq_list[u]):
                pq_list[v], pq_list[u] = pq_list[u], pq_list[v]
            for s, w in pq_list[u]:
                heappush(pq_list[v], (-s, w))
        s1, u1 = heappop(pq_list[v])
        adj_new[v].append(u1)
        adj_new[u1].append(v)
        size[v] = 1-s1
        if pq_list[v]:
            s2, u2 = heappop(pq_list[v])
            adj_new[v].append(u2)
            adj_new[u2].append(v)
            size[v] += -s2

    adj = adj_new
    que = deque()
    que.append(1)
    seen = [-1] * (N+1)
    seen[1] = 0
    par = [0] * (N+1)
    child = [[] for _ in range(N+1)]
    seq = []
    while que:
        v = que.popleft()
        seq.append(v)
        for u in adj[v]:
            if seen[u] == -1:
                seen[u] = seen[v] + 1
                par[u] = v
                child[v].append(u)
                que.append(u)
    seq.reverse()
    print(len(seq))


if __name__ == '__main__':
    main()