import java.util.*;

public class Main{
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			int N = sc.nextInt();
			int[] A = new int[N];
			for(int i = 0; i < N; i++){
				A[i] = sc.nextInt();
			}
			int now = 0;
			for(int i = 0; i < N; i++){
				now = A[now] - 1;
				if(now == 1) {
					System.out.println(i+1);
					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