import java.io.*;
import java.io.IOException;
import java.util.*;

@SuppressWarnings({"rawtypes", "unchecked"})
class Main {
    final static int INF = 1 << 28;
    final static long LNF = 1L << 60;
    final static double EPS = 1e-9;
    final static double GOLDEN_RATIO = (1.0 + Math.sqrt(5)) / 2.0;

    static final long MOD = 1_000_000_007;

    public static void main(String[] args) throws Exception {
        final MyScanner sc = new MyScanner();
        long N;
        N = sc.nextLong();
        long M;
        M = sc.nextLong();
        long[] H = new long[(int)(N)];
        for(int i = 0 ; i < N ; i++){
                H[i] = sc.nextLong();
        }
        long[] A = new long[(int)(M)];
        long[] B = new long[(int)(M)];
        for(int i = 0 ; i < M ; i++){
                A[i] = sc.nextLong() - 1;
                B[i] = sc.nextLong() - 1;
        }
        solve(N, M, H, A, B);
    }

    static void solve(long N, long M, long[] H, long[] A, long[] B){
        ArrayList<Integer>[] cond = new ArrayList[(int)N];

        for (int i = 0; i < cond.length; i++) {
            cond[i]= new ArrayList<Integer>();
        }

        for (int i = 0; i < M; i++) {
            cond[(int)A[i]].add((int)B[i]);
            cond[(int)B[i]].add((int)A[i]);
        }


        int ans = 0;        
        for (int i = 0; i < N; i++) {
            boolean flag = true;
            for (Integer n : cond[i]) {
                if(H[n] >= H[i]) {
                    flag = false;
                    break;
                }
            }
            if (flag) ans++;
        }

        System.out.println(ans);
    }

    static class MyScanner {
 
        BufferedReader br;
        StringTokenizer st;
 
        MyScanner(FileReader fileReader) {
            br = new BufferedReader(fileReader);
        }
 
        MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }
 
        String nn() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
 
        String next() {
            return nn();
        }

        String nextLine() {
            String ans = "";
            try {
                ans = br.readLine();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            return ans;
        }
 
        char nextChar() {
            return nn().charAt(0);
        }
 
        int nextInt() {
            return Integer.parseInt(nn());
        }
 
        long nextLong() {
            return Long.parseLong(nn());
        }
 
        double nextDouble() {
            return Double.parseDouble(nn());
        }
 
        Integer[] niArr0(int n) {
            Integer[] ar = new Integer[n];
            for (int i = 0; i < n; i++) {
                ar[i] = nextInt();
            }
            return ar;
        }
 
        Integer[] niArr1(int n) {
            Integer[] ar = new Integer[n + 1];
            for (int i = 1; i <= n; i++) {
                ar[i] = nextInt();
            }
            return ar;
        }
 
        Long[] nlArr0(int n) {
            Long[] ar = new Long[n];
            for (int i = 0; i < n; i++) {
                ar[i] = nextLong();
            }
            return ar;
        }
 
        Long[] nlArr1(int n) {
            Long[] ar = new Long[n + 1];
            for (int i = 1; i <= n; i++) {
                ar[i] = nextLong();
            }
            return ar;
        }
    }

}


Measured memory_bytes: 60672