func readInts() -> [Int] {
    return readLine()!.split(separator: " ").map { Int($0)! }
}

func main() {
    var n = Int(readLine()!)!
    let As: [Int] = readInts()
    var count = 0
    
    for a in As.reversed() as [Int] {
        if a == n {
            n = n - 1
        } else {
            count += 1
        }
    }
    
    print(count)
}

main()