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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		}
		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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		}
		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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		}
		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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			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+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 count = 1; count 1 int index = 1; index 1 while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		} count <= n count n {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		} index = a[index] index a[index] a index if(index==2) {
				System.out.println(count);
				return;
			} index==2 index 2 {
				System.out.println(count);
				return;
			} System.out.println(count) System.out.println System.out System System.out count return; 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) {
		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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		}
		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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		}
		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 count = 1;
		int index = 1;
		while(count <= n) {
			index = a[index];
			if(index==2) {
				System.out.println(count);
				return;
			}
			count++;
		}
		System.out.println(-1);
	}
}