//master
import java.io.*;
import java.util.*;


public class Main {
    public static int[] h;
    public static boolean[] d;
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        HashMap<Integer, ArrayList<Integer>> map = new HashMap<>();
        h = new int[n];
        for(int i = 0; i<n; i++) { 
            h[i] = sc.nextInt();
            map.put(i,new ArrayList<Integer>());
        }
        for(int i = 0; i<m; i++) { 
            int a = sc.nextInt()-1;
            int b = sc.nextInt()-1;
            map.get(a).add(b);
            map.get(b).add(a);
         }
         int cnt = 0;
         d = new boolean[n];
         for(int i = 0; i<n; i++) {
             if(d[i]) continue; 
             cnt += find(i, map.get(i));
             //pe(i+" "+cnt);
          }
          p(cnt);
    }
    public static int find(int i, ArrayList<Integer> map) {
        for(int nh : map) {
            //pe(i+""+nh);
            if(h[i] <= h[nh]) {
                d[i] = true;
                return 0;
            }else d[nh] = true;
        }
        return 1;
    }

    public static <T> void p(T message) {
        System.out.println(message);
    }

    public static <T> void pe(T message) {
        System.err.println(message);
    }

    public static <T> void pp(T message) {
        System.out.print(message);
    }
    
}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
 
    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }
 
    private boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }
 
    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }
 
    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
 
    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
 
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }
 
    public double nextDouble() {
        return Double.parseDouble(next());
    }
}


Measured memory_bytes: 59664