import Foundation

private func readString() -> String {
    readLine()!
}

private func readStringArray() -> [String] {
    readString().components(separatedBy: " ")
}

private func readInt() -> Int {
    Int(readString())!
}

private func readIntArray() -> [Int] {
    readStringArray().map { Int($0)! }
}

private func readStringTupple() -> (String, String) {
    let array = readStringArray()
    return (array[0], array[1])
}

private func readStringTupple() -> (String, String, String) {
    let array = readStringArray()
    return (array[0], array[1], array[2])
}

private func readIntTupple() -> (Int, Int) {
    let array = readIntArray()
    return (array[0], array[1])
}

private func readIntTupple() -> (Int, Int, Int) {
    let array = readIntArray()
    return (array[0], array[1], array[2])
}

/*＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
 〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓
 ￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣*/

let (n, m) = readIntTupple()
let h = [0] + readIntArray()
var mh = [Int](repeating: 0, count: n + 1)
for _ in 0..<m {
    let (a, b) = readIntTupple()
    mh[a] = max(h[b], mh[a])
    mh[b] = max(h[a], mh[b])
}
var ans = 0
for i in 1..<n+1 {
    ans += mh[i] < h[i] ? 1 : 0
}
print(ans)

/*＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓
￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣*/
