import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.*;


public class Main {

    public static void main(String[] args) {
        FastScanner sc = new FastScanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        Map<Integer,Integer> isGoodMap = new HashMap<>();
        String[] h = sc.nextLine().split(" ");
        int[] height = new int[h.length];
        int[] isGood = new int[h.length];
        for(int i = 0; i<h.length; i++){
            height[i] = Integer.parseInt(h[i]);
        }
        for(int i = 0; i<m;i++){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if(height[a-1] >= height[b-1]){
                isGood[b-1] = 1;
            }
            if(height[b-1]>=height[a-1]){
                isGood[a-1] = 1;
            }
        }
        int count = 0;
        for(int i = 0; i<isGood.length;i++){
            if(isGood[i] != 1){
                count++;
            }
        }
        System.out.println(count);
    }
    public static int[] toArray(List<Integer> target) {

        final int[] result = new int[target.size()];
        for (int i = 0; i < result.length; i++) {
            result[i] = target.get(i);
        }

        return result;
    }
    public static boolean isMultiple (String s, int base, int m) {
	int temp = 0;
	for (int i=0; i<s.length(); i++) {
		temp = (temp*base+Character.getNumericValue(s.charAt(i)))%m;
	}
	if (temp==0) {return true;}
	return false;
}
static class FastScanner {
        private BufferedReader reader = null;
        private StringTokenizer tokenizer = null;

        public FastScanner(InputStream in) {
            reader = new BufferedReader(new InputStreamReader(in));
            tokenizer = null;
        }

        public String next() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public String nextLine() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    return reader.readLine();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }

            return tokenizer.nextToken("\n");
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public double nextDouble() {
             return Double.parseDouble(next());
         }

        public int[] nextIntArray(int n) {
            int[] a = new int[n];
            for (int i = 0; i < n; i++)
                a[i] = nextInt();
            return a;
        }

        public long[] nextLongArray(int n) {
            long[] a = new long[n];
            for (int i = 0; i < n; i++)
                a[i] = nextLong();
            return a;
        }
    }
}


Measured memory_bytes: 54844