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() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                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() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                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() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                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() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                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() - 1;
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            a[i] = sc.nextInt() - 1;
        } {
            a[i] = sc.nextInt() - 1;
        } a[i] = sc.nextInt() - 1 a[i] a i sc.nextInt() - 1 sc.nextInt() sc.nextInt sc 1 int x = 0; x 0 int c = 0; c 0 for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                return;
            }
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                return;
            }
        } {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                return;
            }
        } c++ c x = a[x] x a[x] a x if (x == 1) {
                System.out.println(c);
                return;
            } x == 1 x 1 {
                System.out.println(c);
                return;
            } System.out.println(c) System.out.println System.out System System.out c 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];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                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() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                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() - 1;
        }
        int x = 0;
        int c = 0;
        for (int i = 0; i < n; i++) {
            c++;
            x = a[x];
            if (x == 1) {
                System.out.println(c);
                return;
            }
        }
        System.out.println("-1");
    }
}