# factorial.py
def factorial(n):
    if n<=1:
      return 1
    f=1
    while n>1:
      f=f*n
      n=n-1
    return f
print "factorial(0)=",
print factorial(0)
print "factorial(1)=",
print factorial(1)
print "factorial(2)=",
print factorial(2)
print "factorial(3)=",
print factorial(3)
print "factorial(4)=",
print factorial(4)
print "factorial(52)=",
print factorial(52)