Please code in c language

Exercise 1. (50 points) Approximating In this exercise, we use the following fact to approximate . =i=0(8i+148i+428i+518i+61)16i1. To approximate , we modify the above summation so that i is summed from 0 to n, where n is a non-negative integer. i=0n(8i+148i+428i+518i+61)16i1. In our code, we first read n from the standard input as shown below. Add more code below TODO to finish the code. Note we are not allowed to use power functions in this assignment. Think how we can avoid using power functions in the above summation. Below are outputs from a few example runs. These can be used to check correctness of our code. $./pi n=3 PI=3.1415924576 $./pi n=5 PI=3.1415926532