# Robinhood

You are given integers `n`

, `e`

, `o`

, `t`

. You have `n`

dollars in principal that you invested in the stock market. Given the stock market alternates between first returning `e`

and then `o`

percent interest per year, return how many years it would take to reach at least`t`

dollars.

https://binarysearch.com/problems/Robinhood

## Examples

### Example 1

**Input**

- n =
`100`

- e =
`20`

- o =
`10`

- t =
`130`

**Output**

- answer =
`2`

**Explanation**

- In the first year we earn interest of
`20`

% and end up with $`120`

. - In the second year we earn interest of
`10`

% and end up with $`132`

, which is above the target $`130`

.

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