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