import java.util.*;
import java.io.*;

public class Main{
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int N = Integer.parseInt(in.readLine());
    int[] a = new int[N];
    for(int i=0;i<N;i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int pointer = 0;
    int counter = 0;
    for(int i=0;i<N;i++){
      pointer = a[pointer]-1;
      counter++;
      if(pointer==1){
        System.out.println(counter);
        return;
      }
    }
    System.out.println(-1);
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz