When you are a student, you should hear about the score adjusting rule of the square root times 10. If the teacher promises to apply this rule, all students will become happy, because you will get 60 if your original score is 36. However, those students whose scores are below 36 still feel stressed. One of these students dreams that the teacher says this adjusting rule can be applied several times until the score reaches to 99. If you are good at mathematics, how many times do you know if we want to adjust a score to be 99? Please write a program to answer this question. The program stops when the input score is -1. Please round off each square root number to the 1^st decimal place (e.g., square root(2) = 1.4).

只要當過學生，一定很多人在算分數的時候，聽過老師跟大家說開根號乘以十 。 通常大家這樣都會很開心，因為只要 36 分就可以及格了 ! 但是， 36 分以下的同學就很頭痛了 。 在壓力太大的情況下，有些學生就作夢，夢到老師跟他們說，要讓他們開更號乘以十很多次，可是最後出來的分數要到 99 分才讓他們過 。 數學好的你，可以告訴他們到底最少需要做多少次開根號乘以十，才能夠讓分數等於 99 嗎 ? 當輸入為 -1 時結束程式 。 ( 開根號之後都四捨五入到小數第一位 )