查找整数

import java.io.*;
public class Main{
  public static void main(String[]args)throws Exception{
     BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
     int a = Integer.parseInt(bf.readLine());
     int b[] = new int[a];
     String s[] = bf.readLine().split(" ");
     int c = Integer.parseInt(bf.readLine());
     int number=-1;
     int j=0,i=0;
	for(i=0 ;i<s.length ;i++ ){
	  b[i]=Integer.parseInt(s[i]);
	}
	for ( i=0; i<a;i++ ){
	 if (b[i]==c){
	   number=i+1;
           break;
	 }
        }
	  System.out.println(number);
	
  }
}