num = int(input("Enter a number: ")) # Add your numbers

factorial = 1

if num < 0:
    print("Factorial does not exist for negative numbers") # !0=1
elif num == 0:
    print("Factorial of 0 is 1")
else:
    for i in range(1, num + 1):
        factorial *= i
    print("Factorial of", num, "is", factorial)