##def main():
##    #sum the first n natural numbers
##
##    n = input("Please enter the number of natuural numbers to be summed: ")
##    n = int(n)
##    total=0
##    for number in range(n+1):
##        total = total+number
##
##    print("the sum of the first",n,"Natural numbers is",total)

def main():
    #computer n!, where n is given by the user

    n = int(input("Please enter an integer value for n: "))

    fact=1
    for number in range(1,n+1):
        fact = number*fact

    print(n,"! is",fact)

main()