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