import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc  = new Scanner(System.in);

        int N = sc.nextInt();
        int button [] = new int [N]; 

        for (int i = 0; i < N; i++) {
            button[i] = sc.nextInt();
        } 

        int now = 1;
        int count = 0;

        for (;;) {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        }
    }
} import java.util.*; util.* java class Main {
    public static void main(String[] args) {
        Scanner sc  = new Scanner(System.in);

        int N = sc.nextInt();
        int button [] = new int [N]; 

        for (int i = 0; i < N; i++) {
            button[i] = sc.nextInt();
        } 

        int now = 1;
        int count = 0;

        for (;;) {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        }
    }
} Main public static void main(String[] args) {
        Scanner sc  = new Scanner(System.in);

        int N = sc.nextInt();
        int button [] = new int [N]; 

        for (int i = 0; i < N; i++) {
            button[i] = sc.nextInt();
        } 

        int now = 1;
        int count = 0;

        for (;;) {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        }
    } main {
        Scanner sc  = new Scanner(System.in);

        int N = sc.nextInt();
        int button [] = new int [N]; 

        for (int i = 0; i < N; i++) {
            button[i] = sc.nextInt();
        } 

        int now = 1;
        int count = 0;

        for (;;) {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        }
    } Scanner sc  = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int button [] = new int [N]; button new int [N] N for (int i = 0; i < N; i++) {
            button[i] = sc.nextInt();
        } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
            button[i] = sc.nextInt();
        } {
            button[i] = sc.nextInt();
        } button[i] = sc.nextInt() button[i] button i sc.nextInt() sc.nextInt sc int now = 1; now 1 int count = 0; count 0 for (;;) {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        } ; {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        } {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        } if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            } now == 2 now 2 {
                System.out.println( count );
                break;
            } System.out.println( count ) System.out.println System.out System System.out count break; if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            } count >= N count N {
                System.out.println( -1 );
                break;
            } System.out.println( -1 ) System.out.println System.out System System.out -1 1 break; {
                count++;
                now = button[now - 1];
            } count++ count now = button[now - 1] now button[now - 1] button now - 1 now 1 String[] args args
import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc  = new Scanner(System.in);

        int N = sc.nextInt();
        int button [] = new int [N]; 

        for (int i = 0; i < N; i++) {
            button[i] = sc.nextInt();
        } 

        int now = 1;
        int count = 0;

        for (;;) {
            if ( now == 2) {
                System.out.println( count );
                break;
            } else if ( count >= N ) {
                System.out.println( -1 );
                break;
            } else {
                count++;
                now = button[now - 1];
            }
        }
    }
}