import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int A[] =new int[N];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            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) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int A[] =new int[N];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            if(num==2){
                System.out.println(count);
                return;
            }
            num=A[num-1];
            count++;
            
        }
        
        System.out.println(-1);
        
        
        
    }
} Main public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int A[] =new int[N];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            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];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            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 int num=1; num 1 int count=0; count 0 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 j=0;j<N;j++){
            if(num==2){
                System.out.println(count);
                return;
            }
            num=A[num-1];
            count++;
            
        } int j=0; int j=0; j 0 j<N j N j++ j++ j {
            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) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int A[] =new int[N];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            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) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int A[] =new int[N];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            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) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int A[] =new int[N];
        int num=1;
        int count=0;
        
        for(int i=0;i<N;i++){
            A[i]=sc.nextInt();
            
        }
        
        for(int j=0;j<N;j++){
            if(num==2){
                System.out.println(count);
                return;
            }
            num=A[num-1];
            count++;
            
        }
        
        System.out.println(-1);
        
        
        
    }
}
