import std;

void main() {
    int n, m; scan(n, m);
    auto hs = readints;

    auto s = new bool[n];
    foreach (_; 0..m) {
        int a, b; scan(a, b);
        a--; b--;
        if (hs[a] <= hs[b]) s[a] = true;
        if (hs[a] >= hs[b]) s[b] = true;
    }
    auto ans = s.count!"!a";
    writeln(ans);
}

void scan(T...)(ref T a) {
    string[] ss = readln.split;
    foreach (i, t; T) a[i] = ss[i].to!t;
}
T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;
