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 cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        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];
        int cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        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];
        int cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        System.out.println("-1");
    } main {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        int cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        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 int cnt = 0; cnt 0 int s = 1; s 1 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 for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        } int i=0; int i=0; i 0 i<a.length i a.length a a.length i++ i++ i {
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        } {
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        } s = a[s-1] s a[s-1] a s-1 s 1 cnt++ cnt if(s == 2){
                System.out.println(cnt);
                return;
            } s == 2 s 2 {
                System.out.println(cnt);
                return;
            } System.out.println(cnt) System.out.println System.out System System.out cnt return; System.out.println("-1") System.out.println System.out System System.out "-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];
        int cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        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];
        int cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        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];
        int cnt = 0;
        int s = 1;
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        
        for(int i=0; i<a.length; i++){
            s = a[s-1];
            cnt++;
            if(s == 2){
                System.out.println(cnt);
                return;
            }
        }
        System.out.println("-1");
    }
}