#!/usr/bin/python

import sys;

def factorial(num):
    result = 1
    for i in range(1,num+1):
	result *= i
    return result

def sumDigits(num):
    sum = 0;
    for i in range (0,len(num)):
        sum += int(num[i]);

    return sum;


print "Result is: " + str(sumDigits(str(factorial(int(sys.argv[1])))))