/******************************************************************************
Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl,
C#, OCaml, VB, Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog.
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*******************************************************************************/
#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define int long long
int n,arr[300001];
int depth[300001];
int fre[300001];
vector <int> v[300001];
void dfs(int i,int last,int cnt){
depth[cnt]++;
for(int j:v[i]) if(j!=last) dfs(j,i,cnt+1);
return;
}
int calc(int k){
for(int i=1;i<=n;i++) fre[i]=depth[i];
int day=0,prog=1,crew=k,flag=1;
for(int i=1;i<=n;i++){
if(day==i) flag=0;
while(fre[i]!=0){
if(day==i) flag=0;
if(fre[i]>crew){
fre[i]-=crew;
crew=0;
}
else{
crew-=fre[i];
fre[i]=0;
}
if(crew==0){
day++;
crew=k;
}
}
}
return flag;
}
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin>>n;
for(int i=0;i<n-1;i++){
int a,b;
cin>>a>>b;
v[a].push_back(b);
v[b].push_back(a);
}
dfs(1,0,0);
int l=1,r=n,ans=1e9;
while(l<=r){
int k=(l+r)/2;
if(calc(k)==1){
ans=k;
r=k-1;
}
else l=k+1;
}
cout<<ans<<endl;
return 0;
}
