Time Limit: 3000 MS Memory Limit: 65536 K

## Description

Suppose you open a savings account with a certain initial balance. You will not
make any withdrawals or further deposits for a number of years. The bank will
compound your balance (add the annual interest) once a year, on the anniversary
of the opening of the account. Your goal is to achieve a certain target amount in
your savings account. In how may years will the target amount be achieved?
## Input

The input file will contain data for one or more test cases, one test case per
line. Each line will contain three numbers: the initial balance, the annual
interest rate (as a percentage of the balance), and the target amount, separated
by blank spaces. These will be positive numbers; they may or may not contain a
decimal point. The target amount will be greater than the initial balance. The
input is terminated by end-of-file
## Output

For each line of input, your program will produce exactly one line of output:
This line will contain one positive integer value: the number of years required
to achieve the target amount.
## Sample Input

200.00 6.5 300
500 4 1000.00
## Sample Output

7
18