查找整数

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		
		int n=scan.nextInt();
		
		int [] arr=new int[n];
		
		for(int i=0;i<n;i++){
			
			arr[i]=scan.nextInt();
		}
		
		int num=scan.nextInt();
		
		for(int i=0;i<n;i++){
			
			if(num==arr[i]){
				
				System.out.println(i+1);
				
				break;	
				
			}else if(i==n-1){
				
				System.out.println(-1);
			}
		}	
	}
}