import java.util.*;
 
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int a[] = new int[N];
        int ans = 0;
 
        for(int i=0; i<N; i++){
            a[i] = sc.nextInt();
        }
 
        int x = 1;
        for(int i=0; i<N; i++){
            ans++;
            x = a[x-1];
            if(x==2){
                System.out.println(ans);
                break;
            }
            if(i==N-1)
                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