import sys
input = sys.stdin.readline

class SegmentTree:
    def __init__(self, size, op, identity):
        n = 1 << (size - 1).bit_length()
        self.size = n
        self.op = op
        self.identity = identity
        self.node = [identity] * (2 * n)

    def __getitem__(self, k):
        return self.node[k + self.size]

    def build(self, v):
        for k in range(len(v)):
            self.node[k + self.size] = v[k]
        for k in range(self.size - 1, 0, -1):
            self.node[k] = self.op(self.node[2 * k], self.node[2 * k + 1])

    def update(self, k, x):
        k += self.size
        self.node[k] = x
        while k > 1:
            k >>= 1
            self.node[k] = self.op(self.node[2 * k], self.node[2 * k + 1])

    def fold(self, l, r):
        vl = vr = self.identity
        l += self.size
        r += self.size
        while l < r:
            if l & 1:
                vl = self.op(vl, self.node[l])
                l += 1
            if r & 1:
                r -= 1
                vr = self.op(self.node[r], vr)
            l >>= 1
            r >>= 1
        return self.op(vl, vr)

def euler_tour(G, root):
    N = len(G)
    stack = [(root, -1, 1), (root, -1, 0)]
    et = []
    first = [-1] * N
    last = [-1] * N
    k = 0
    while stack:
        v, p, t = stack.pop()
        if t == 0:
            et.append(v)
            first[v] = k
            k += 1
            for c in G[v]:
                if c != p:
                    stack.append((c, v, 1))
                    stack.append((c, v, 0))
        else:
            last[v] = k
    return et, first, last

N = int(input())
G = [[] for _ in range(N)]
for _ in range(N-1):
    x, y = map(lambda x: int(x)-1, input().split())
    G[x].append(y)
    G[y].append(x)
et, first, last = euler_tour(G, 0)
st = SegmentTree(N, max, (0, -1))
for v in et[::-1]:
    m = 1
    for _ in range(2):
        x, i = st.fold(first[v], last[v])
        if i != -1:
            m += x
            st.update(i, (0, -1))
    st.update(first[v], (m, first[v]))
print(st[0][0])