import Foundation

let input_line: String = readLine()!
let split: [String] = input_line.components(separatedBy: " ") //ブランクで区切られている場合

var x = Int64(split[0])!

var money: Int64 = 100

var ans = 0
while (money < x) {
    money = Int64(Double(money) * 1.01)
    ans += 1
}

print(ans)