膨胀的牛牛

import java.util.Scanner;

/*
 * 不多说，在线处理
 * 每输入一个数，若与A相同，A= A*2
 */

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        int A = in.nextInt();
        int[] num = new int[N];
        for(int i = 0 ; i < N ; i++){
            num[i] = in.nextInt();
            if(num[i] == A){
                A *= 2;
            }
        }
        System.out.println(A);
        in.close();
    }

}