import java.util.Scanner;

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 count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        }
        System.out.println(-1);

    }

} import java.util.Scanner; Scanner 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 count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 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];
        for (int i = 0 ; i < N ; i++ ) {
            a[i] = sc.nextInt();
        }
        int count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        }
        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 count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 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 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 count = 0; count 0 int temp = 1; temp 1 for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        } int i = 0 ; int i = 0 ; i 0 i < N i N i++ i++ i {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        } {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        } temp = a[temp - 1] temp a[temp - 1] a temp - 1 temp 1 count++ count if (temp == 2) {
                 System.out.println(count);
                 return;
             } temp == 2 temp 2 {
                 System.out.println(count);
                 return;
             } System.out.println(count) System.out.println System.out System System.out count return; 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 count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 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];
        for (int i = 0 ; i < N ; i++ ) {
            a[i] = sc.nextInt();
        }
        int count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        }
        System.out.println(-1);

    }

} Main
import java.util.Scanner;

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 count = 0;
        int temp = 1;
        for (int i = 0 ; i < N ; i++ ) {
             temp = a[temp - 1];
             count++;
             if (temp == 2) {
                 System.out.println(count);
                 return;
             }
        }
        System.out.println(-1);

    }

}