Write a while loop fragment that calculates the following values:a) Sum of the first n counting numbers: 1 2 3 . . . nb) Sum of the first n odd numbers: 1 3 5 . . . 2n - 1c) Sum of a series of numbers entered by the user until the value 999 is entered. Note: 999 should not be part of the sum. d) The number of times a whole number n can be divided by 2 (using integer division) before reaching 1 (i. e., log2n).