x=int(raw_input("enter the number1: "))
for y in range(2,x):
	if x%y==0:
		print("not a prime")
		break
else:
	print("is a prime")


x=[5, 7, 12, 20]
i=0
count<len(x)
while i<count:
	if x[i]:
		pass
	pass
count=0
for count<=x:
	if x%y==0:
		print("not a prime")
		break
else:
	print("is a prime")