fun main(args: Array<String>){
    val X = readLine()!!.toLong()
    var motohyaku:Double = 100.0
    var nensuu = 0

    while (X > motohyaku){
        motohyaku = Math.floor(motohyaku * 1.01)
        nensuu += 1
    }
    println(nensuu)
}