import java.util.Scanner;

public class Main{
    public static void main(String[] args){
	Scanner scan = new Scanner(System.in);

	int n = scan.nextInt();
	int m = scan.nextInt();
	int x = scan.nextInt();
	int[] a = new int[m];
	int[] cost = new int[n+1];
	for(int i = 0; i < m; i++){
	    a[i] = scan.nextInt();
	    cost[a[i]]++;
	}

	int[] ruiseki = new int[n+1];
	for(int i = 1; i < n+1; i++){
	    ruiseki[i] = ruiseki[i-1]+cost[i];
	}

	if(ruiseki[x-1] >= (ruiseki[n]-ruiseki[x])){
	    System.out.println(ruiseki[n]-ruiseki[x]);
	}else{
	    System.out.println(ruiseki[x-1]);
	}
    }
}
			       

/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