#include <bits/stdc++.h>
using namespace std;
#define ll long long
int const N=3e5+5;
int const mod=1e9+7;
vector<int> adj[N];
int dp[N],n,cur;
void dfs(int node,int par){
dp[node]=adj[node].size();
if(par>0)
dp[node]--;
dp[node]-=cur;
for(int i:adj[node])
if(i!=par){
dfs(i,node);
dp[node]+=dp[i];
}
dp[node]=max(dp[node],0);
}
bool solve(int k){
for (int i = 0; i <=n; ++i)
dp[i]=0;
cur=k;
dfs(1,0);
return (dp[1]==0);
}
int main(){
cin>>n;
for (int i = 1; i < n; ++i)
{
int u,v;
cin>>u>>v;
adj[u].push_back(v);
adj[v].push_back(u);
}
int low=-1,high=n;
while(high-low>1){
int mid=(high+low)/2;
if(solve(mid))
high=mid;
else
low=mid;
}
cout<<high<<endl;
return 0;
}
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