#include <bits/stdc++.h>
#define int int64_t
#define REP(i, n) for (int i = 0; (i) < (int)(n); ++ (i))
#define REP3(i, m, n) for (int i = (m); (i) < (int)(n); ++ (i))
#define REP_R(i, n) for (int i = (int)(n) - 1; (i) >= 0; -- (i))
#define REP3R(i, m, n) for (int i = (int)(n) - 1; (i) >= (int)(m); -- (i))
#define REPP(i, n) for (int i = 1; (i) < (int)(n+1); ++ (i))
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define FORP(i, m, n) for(int i = m; i < n+1; i++)
#define FORR(i, a, b) for(int i=(b)-1; i>=(a); i--)
#define ALL(v) v.begin(), v.end()
#define SZ(a) int((a).size())
#define SORT(c) sort((c).begin(),(c).end())
#define SORTR(c) sort((c).begin(),(c).end(),greater<int>());
#define BIT(n) (1LL<<(n))
#define PCNT(x) __builtin_popcountll(x)
#define GCD(x,y) __gcd(x,y)
#define LCM(x,y) x/__gcd(x,y)*y
#define PB push_back
#define MP make_pair
#define endl "\n"
#define pa cout << ans << endl
#define p(x) cout << x << endl
#define pall(x) for(auto iter : x) p(iter)
#define yes cout << "Yes" << endl
#define no cout << "No" << endl
#define yn(x) cout << (x ? "Yes" : "No") << endl
using namespace std;
typedef long double LD;
typedef vector<int> VI;
typedef vector<vector<int> > VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef vector<PII> VPII;
using UnweightedGraph = vector<vector<int> >;
using WeightedGraph = vector<vector<pair<int, int> > >;
const int INF = 2000000000ll;
const long double PI = acosl(-1);
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }



int power(int a, int b) {return b?power(a*a,b/2)*(b%2?a:1):1;}
int perm(int N, int K){
    int x=1;
    for(int i=1;i<=K;i++)
    {
        x=x*(N-i+1);
    }
    return x;
}
int factorial(int N) {return perm(N,N);}
int comb(int N,int K) {return factorial(N)/factorial(K)/factorial(N-K);}
int hcomb(int N, int K) {return comb(N+K-1, N-1);}

int dtoi(double d) {return round(d);}

int isprime(int n) {
    if (n < 2) return 0;
    for (int i = 2; i*i <= n; ++i) {
        if (n % i ==  0) return 0;
    }
    return 1;
}

int mystoll(string S){
    int num = 0;
    for (int i = (int) S.length()-1; i >= 0; i--){
        num += (S[i]-'0') * power(10,S.length()-1-i);
    }
    return num;
}

template<class T>
int SUM(T a) {
    int sum = 0;
    for(auto iter : a) sum += iter;
    return sum;
}

void solve(int N, int M, const vector<int> & H, const vector<int> & A, const vector<int> & B);

signed main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    cout << fixed << setprecision(10);
    int N, M;
    cin >> N;
    vector<int> H(N);
    cin >> M;
    vector<int> A(M), B(M);
    REP (i, N) {
        cin >> H[i];
    }
    REP (i, M) {
        cin >> A[i] >> B[i];
        A[i]--;
        B[i]--;
    }
    solve(N, M, H, A, B);
    return 0;
}

struct UnionFind {
    vector<int> par;
    
    UnionFind(int N) : par(N) {
        REP(i, N) par[i] = -1;
    }
    
    int root(int x) {
        if (par[x] < 0) return x;
        return par[x] = root(par[x]);
    }
    
    void unite(int x, int y) {
        int rx = root(x);
        int ry = root(y);
        if (rx == ry) return;
        if (par[rx] > par[ry]) swap(rx, ry);
        par[rx] += par[ry];
        par[ry] = rx;
        return;
    }
    
    bool same(int x, int y) {
        int rx = root(x);
        int ry = root(y);
        return rx == ry;
    }
    
    int size(int x) {
        return -par[root(x)];
    }
};

void dfs(const vector<vector<int> > &G, int v, vector<int> &seen) {
    seen[v] = true; // v を訪問済にする

    // v から行ける各頂点 next_v について
    for (int next_v : G[v]) {
        if (seen[next_v]) continue; // next_v が探索済だったらスルー
        dfs(G, next_v, seen); // 再帰的に探索
    }
}

void solve(int N, int M, const vector<int> & H, const vector<int> & A, const vector<int> & B) {
    int ans = 0;
    UnweightedGraph G(N);
    REP(i,M) {
        G[A[i]].PB(B[i]);
        G[B[i]].PB(A[i]);
    }
    vector<int> seen;
    seen.assign(N, false);
    int count = 0;
    int chk = 1;
    for (int v = 0; v < N; ++v) {
        chk = 1;
        for (int itr : G[v]) if (H[v] <= H[itr]) chk = 0;
        if (chk) count++;
    }
    cout << count << endl;
}

/*
cd ~/Desktop/Programming/AtCoder/contest/abc166/abc166_c && sh test.sh
cd ~/Desktop/Programming/AtCoder/contest/abc166/abc166_c && sh etest.sh
cd ~/Desktop/Programming/AtCoder/contest/abc166/abc166_c && sh submit.sh
*/


Measured memory_bytes: 12180