fun main() {
    val n = readln().toInt()
    val s = readln()

    for(i in 0..<n) {
        if(s[i] == '4') {
            if(s[i+1] == '0') {
                if(s[i+2] == '4') {
                    println( "Found" )
                    return


                }
            }
        }

    }
    println( "Notfound")


}