import java.util.Scanner;

public class Main {

	static Scanner sc = new Scanner(System.in);
	
	public static void main(String[] args) {
		
		int n = sc.nextInt();//输入整数n
		
		int nArr[] = new int[n];//存储n个整数数列
		for (int i = 0; i < nArr.length; i++) {
			nArr[i] = sc.nextInt();
		}
		
		int a = sc.nextInt(); //要查找的整数a
		
		System.out.println(selectAIndex(nArr,a));
		
	}
	
	//查找a在intArr数组中第一次出现的位置
	static public int selectAIndex(int intArr[],int a) {
		int index = -1;
		for (int i = 0; i < intArr.length; i++) {
			if(intArr[i] == a) {
				index = i;
				return index+1;
			}
		}
		
		return index;
	}
}