import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Comparator;


public class xianduanhedian {
 private static InputStream is = System.in;

 public static int nextInt() {
  try {
   int i;

   while ((i = is.read()) < 45 || i > 57) {
   }

   int mark = 1, temp = 0;

   if (i == 45) {
    mark = -1;
    i = is.read();
   }

   while (i > 47 && i < 58) {
    temp = temp * 10 + i - 48;
    i = is.read();
   }

   return temp * mark;
  } catch (IOException e) {
   e.printStackTrace();
  }

  return -1;
 }

 static class Node {
  public int start;
  public int end;

  public Node(int start, int end) {
   this.start = start;
   this.end = end;
  }

 }

 public static void main(String[] args) {
  int n = nextInt();
  int m = nextInt();
  int point[] = new int[n];
  for (int i = 0; i < n; i++)
   point[i] = nextInt();
  Node node[] = new Node[m];
  for (int i = 0; i < m; i++)
   node[i] = new Node(nextInt(), nextInt());
  Arrays.sort(point);
  Arrays.sort(node, new Comparator<Node>() {
   public int compare(Node o1, Node o2) {
    return o1.end - o2.end;
   }
  });
  int currentPoint = 0;
  int count = 0;
  int j = 1;
  for (int i = 0; i < m; i++) {
   int x = node[i].start;
   int y = node[i].end;
   if (x <= currentPoint)
    continue;
   int temp = -1;
   for (j -= 1; j < n; j++) {
    if (point[j] <= y) {
     temp = point[j];
    } else {
     break;
    }
   }
   if (temp == -1) {
    count = 0;
    break;
   } else {
    currentPoint = temp;
    count++;
   }

  }
  System.out.println(count);
 }

}