I need to sum the result of a formula, repeated several times, which has a single value that changes from 1 to 180.The final formula must be contained in a single cell.

[![my table](https://i.stack.imgur.com/WZ1X5.png)](https://i.stack.imgur.com/WZ1X5.png)

1. Column A contains values ​​from 1 to 180 (to simplify in the example I have only put 13).
2. Cell B1 contains a value expressed as a percentage.
3. Column C (C1 to C13) contains the following formula (cell C1 in the example):
`=+((1/(1+(A1*1/12*$B$1)))).`
4. Cell C14 contains the sum of all results.

By defining X the variable value of column A, the formula is in practice the following:
[![formula](https://i.stack.imgur.com/qYkUE.png)](https://i.stack.imgur.com/qYkUE.png)

Column A will be not present in my sheet, so therefore I cannot refer my formula to the contents of any cell.
My need is to have only two cells in my sheet: B1, with the rate value; and C1, with the sum of the products with X from 1 to 180. That is what is contained in cell C14.

Thanks for your help and for your patience with my bad English.