import sys
sys.setrecursionlimit(10**7)
N = int(input())
AB = [list(map(int,input().split())) for _ in range(N-1)]
L = [[] for _ in range(N)]
for a,b in AB:
    L[a-1].append(b-1)
    L[b-1].append(a-1)
#木の数
DP = [[0]*2 for _ in range(N)]
def dfs(i,p):
    for l in L[i]:
        if l !=p:
            dfs(l,i)
    for l in L[i]:
        if l !=p:
            DP[i][0]+=max(DP[l][0]-1,DP[l][1])
            DP[i][1]+=max(DP[l])
    DP[i][0]+=1
dfs(0,-1)
print(max(DP[0]))