import java.util.*;

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

      int a = scan.nextInt();
      int b = scan.nextInt();
      int X = scan.nextInt();

      int[] arr = new int[a + 1];
      int   u, count = 0;
      int   abs, sum = 0;
      for(int i = 0; i < a + 1; i++){
          arr[i] = 0;
          }
      for(int i = 0; i < b; i++){
          u      = scan.nextInt();
          arr[u] = 1;
          }

      for(int i = 0; i < X; i++){
          sum += arr[i];
          }
      //if(sum >= 1){
        // sum -= 1;
         //}

      for(int i = X; i < a + 1; i++){
          count += arr[i];
          }
     // count -= 1;


      System.out.println(Math.min(sum, count));
   }
}

/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