PROGRAMMING:Double deposit

Lao Liu has a one-year fixed deposit in the bank. After maturity, he will deposit for another year with interest and capital. If the bank interest rate remains unchanged, please calculate: how many years will Lao Liu have to deposit to double the amount of deposit?
####Input format
>Annual interest rate
####Output format
>Years
####Input sample
```in
three point two five
```
####Output sample
```out
twenty-two
```







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