import sys
sys.setrecursionlimit(10**6)


def main():
  N = int(input())
  G = [[] for _ in range(N + 5)]
  for i in range(N - 1):
    u, v = map(int, input().split())
    G[u].append(v)
    G[v].append(u)

  dp = [[0] * 5 for _ in range(N + 5)]
  root = 1
  dfs(root, -1, G, dp)
  ans = max(dp[root][0], dp[root][1])
  print(f"{ans}")
  return


def dfs(u, parent, G, dp):
  dp[u][0], dp[u][1] = 1, 0
  for v in G[u]:
    if v == parent: continue
    dfs(v, u, G, dp)
    dp[u][0] += max(dp[v][0] - 1, dp[v][1])
    dp[u][1] += max(dp[v][0], dp[v][1])

  return


if __name__ == '__main__':
  main()