#
#  Compute n-factorial for some n-value entered by the user
#

# Read n from the user
n = int(input("Enter an integer: "))

# Save the original value of n so that it is available for the output message
original_n = n

# Initialize result to 1
result = 1

# Compute n-factorial
# while n is greater than 0
while n > 0:
  # multiply the result so far by the current value of n, storing it back
  # into result
  result = result * n

  # decrease the value of n
  n = n - 1

# Display the result
if n < 0:
  print("Couldn't compute the factorial of a negative number")
else:
  print(original_n, "factorial is", result)