A group consisting of a vicious lion, zebra, hippo, and giraffe assaulted an innocent cuddly group of penguins. The penguins endured a terrible beating and the number of their bruises was too great to be counted by with their simple technology. Skikowal, the penguin's head of tech, resorted to his best friend for help. Macintosh suggested using code to count the number of bruises and for fun find the factorial of the total number of bruises.
Input Format
A list of 4 positive integers representing the number of bruises received by each penguin.
Sample Input
4
5
2
3
Output Format The factorial of the sum of all the bruises is printed out.
Sample Output
87178291200You must be logged in to submit a solution.