查找整数

import java.util.Arrays;
import java.util.LinkedList;
import java.util.Queue;
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 x = sc.nextInt();
		int i= 0;
		for( i= 0 ; i < n ; i++ ){
			if(x == a[i]){
				System.out.println(i+1);
				break;
			}
		}
		if(i == n){
			System.out.println(-1);
		}
	}
	
	
}