#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  vector<int> S(N);
  for(int i=0;i<N;i++){
    cin>>S[i];
    S[i]--;
  } 
  int now = 0;
  int ans = 0;
  while(now != N-1){
    ans++;
    now = S[now];
  }
  cout<<ans<<endl;
}