helpcross

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringTokenizer;

public class helpcross {
	public static int c, n;
	public static int[] chickens;
	public static Cow[] cows;
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new FileReader("helpcross.in"));
		PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("helpcross.out")));
		StringTokenizer st = new StringTokenizer(br.readLine());
		c = Integer.parseInt(st.nextToken());
		n = Integer.parseInt(st.nextToken());
		chickens = new int[c];
		cows = new Cow[n];
		for(int i = 0; i < c; i++) {
			chickens[i] = Integer.parseInt(br.readLine());
		}

		for(int i = 0; i < n; i++) {
			st = new StringTokenizer(br.readLine());
			Cow temp = new Cow(Integer.parseInt(st.nextToken()), Integer.parseInt(st.nextToken()));
			cows[i] = temp;
		}

		Arrays.sort(chickens);
		Arrays.sort(cows, new Comparator<Cow>() {
			public int compare(Cow c1, Cow c2) {
				if(c1.end < c2.end)
					return -1;
				if(c2.end < c1.end)
					return 1;
				if(c1.start < c2.start)
					return -1;
				if(c2.start < c1.start)
					return 1;
				return 0;
			}

		});
//		System.out.println(Arrays.toString(chickens));
//		System.out.println(Arrays.toString(cows));
		boolean[] visited = new boolean[c];
		for(Cow moo: cows) {
			for(int i = 0; i < c; i++) {
				if(!visited[i] && moo.start <= chickens[i] && chickens[i] <= moo.end) {
					visited[i] = true;
					break;
				}
			}
		}
		int ans = 0;
		for(boolean b: visited) {
			if(b)
				ans++;
		}
		out.println(ans);
		out.close();
	}

	static class Cow {
		int start, end;
		public Cow(int start, int end) {
			this.start = start;
			this.end = end;
		}

		public String toString() {
			return start + "," + end;
		}
	}

}