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+1];

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

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

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

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

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

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

		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] a = new int[N+1];

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

		int push = 0;
		for(int j=0;j<N;j++) {
			if(i == 2) {
				System.out.println(push);
				return;
			}else {
				push++;
				i = a[i];
			}
		}
		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+1]; a new int[N+1] N+1 N 1 for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		} int i=1; int i=1; i 1 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 i=1; i 1 int push = 0; push 0 for(int j=0;j<N;j++) {
			if(i == 2) {
				System.out.println(push);
				return;
			}else {
				push++;
				i = a[i];
			}
		} int j=0; int j=0; j 0 j<N j N j++ j++ j {
			if(i == 2) {
				System.out.println(push);
				return;
			}else {
				push++;
				i = a[i];
			}
		} {
			if(i == 2) {
				System.out.println(push);
				return;
			}else {
				push++;
				i = a[i];
			}
		} if(i == 2) {
				System.out.println(push);
				return;
			}else {
				push++;
				i = a[i];
			} i == 2 i 2 {
				System.out.println(push);
				return;
			} System.out.println(push) System.out.println System.out System System.out push return; {
				push++;
				i = a[i];
			} push++ push i = a[i] i a[i] a i 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+1];

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

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

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

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

		for(int i=1;i<=N;i++) {
			a[i] = sc.nextInt();
		}

		int i=1;

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

}
