import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int n = sc.nextInt();
		// スペース区切りの整数の入力
		int m = sc.nextInt();
		int x = sc.nextInt();

		int[] a = new int[n + 1];
		int pn = 0;
		int p0 = 0;
		for (int i = 0; i < m; i++) {
			a[i] = sc.nextInt();
			if (x > a[i]) {
				p0++;
			} else if (x < a[i]) {
				pn++;
			}
		}
		if (pn >= p0) {
			System.out.println(p0);

		} else {
			System.out.println(pn);
		}
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz