#include "bits/stdc++.h"
using namespace std;
#define int long long
#define endl '\n'
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

const int MAX_N=1e5+2;
vector<int> G[MAX_N];
vector<int> rG[MAX_N];
vector<int> dp[MAX_N];

void dfs(int p){
  if(G[p].size()==0){
    dp[rG[p][0]].push_back(1);
    return;
  }
  for(int i=0;i<G[p].size();i++){
    dfs(G[p][i]);
  }
  sort(dp[p].begin(),dp[p].end(),greater<int>());
  int maxn=0;
  for(int i=0;i<dp[p].size();i++){
    maxn=max(maxn,dp[p][i]+i+1);
  }
  dp[rG[p][0]].push_back(maxn);
  return;
}

signed main(){
  int n;
  cin>>n;
  for(int i=1;i<n;i++){
    int a;
    cin>>a;
    a--;
    G[a].push_back(i);
    rG[i].push_back(a);
  }
  rG[0].push_back(MAX_N-1);
  dfs(0);
  cout<<dp[MAX_N-1][0]-1<<endl;
}

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