The value of the mathematical constant e can be expressed as an infinite series e = 1 + 1/1! + 1/2! + 1/3! +... Write a program that approximates e by computing the value of 1 + 1/1! + 1/2! + 1/3! + ... + 1! where n is ail integer entered by the user. Sample input: 3 Sample output: 2.666667