import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws Exception {
        try {
            Scanner sc = new Scanner(System.in);
            int n = sc.nextInt();
            int[] input = new int[n];
            for (int i = 0; i < n; i++) {
                input[i] = sc.nextInt();
            }

            int now = input[0];
            int count = 1;
            boolean flag = false;
            while (count < n) {
                if (now == 2) {
                    System.out.println(count);
                    flag = true;
                    break;
                }
                now = input[now - 1];
                count++;
            }
            if (!flag) {
                System.out.println(-1);
            }
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

/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