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- #include <bits/stdc++.h>
- #define forn(i, n) for (int i = 0; i < int(n); i++)
- #define ford(i, n) for (int i = int(n) - 1; i >= 0; i--)
- #define fore(i, l, r) for (int i = int(l); i < int(r); i++)
- #define correct(x, y, n, m) (0 <= (x) && (x) < (n) && 0 <= (y) && (y) < (m))
- #define all(a) (a).begin(), (a).end()
- #define sz(a) int((a).size())
- #define pb(a) push_back(a)
- #define mp(x, y) make_pair((x), (y))
- #define x first
- #define y second
- using namespace std;
- typedef long long li;
- typedef long double ld;
- typedef pair<int, int> pt;
- template<typename X> inline X abs(const X& a) { return a < 0? -a: a; }
- template<typename X> inline X sqr(const X& a) { return a * a; }
- const int INF = int(1e9);
- const li INF64 = li(1e18);
- const ld EPS = 1e-9, PI = 3.1415926535897932384626433832795;
- const int N = 500500;
- int n;
- vector<int> g[N];
- inline bool read() {
- if (!(cin >> n)) return false;
- forn(i, n) g[i].clear();
- forn(i, n - 1) {
- int x, y;
- assert(scanf("%d%d", &x, &y) == 2);
- x--, y--;
- g[x].pb(y), g[y].pb(x);
- }
- return true;
- }
- vector<int> z;
- void dfs(int v, int p, int d) {
- int c = 0;
- forn(i, sz(g[v])) {
- int to = g[v][i];
- if (to == p) continue;
- c++;
- dfs(to, v, d + 1);
- }
- if (!c) z.pb(d);
- }
- int solve(int v, int p) {
- z.clear();
- dfs(v, p, 0);
- sort(all(z));
- forn(i, sz(z)) {
- if (i) z[i] = max(z[i - 1] + 1, z[i]);
- }
- return z.back();
- }
- inline void solve() {
- int ans = 0;
- forn(i, sz(g[0]))
- ans = max(ans, solve(g[0][i], 0) + 1);
- cout << ans << endl;
- }
- int main() {
- #ifdef SU1
- assert(freopen("input.txt", "rt", stdin));
- //assert(freopen("output.txt", "wt", stdout));
- #endif
- cout << setprecision(10) << fixed;
- cerr << setprecision(5) << fixed;
- while (read()) {
- solve();
- //break;
- }
- return 0;
- }
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