# Arup Guha
# 2/13/2020
# Solution to COP 2930 Individual Program #3A: Factorial

def main():

    # Get the user input.
    n = int(input("For what integer do you want the factorial?\n"))

    # Start our result at 1.
    ans = 1

    # Multiply in each number into our result from 1 to n.
    for i in range(1, n+1):
        ans *= i

    # Print the final result.
    print(n,"! = ",ans, sep="")

# Run it!
main()