[Timotay]

ok this is my code;
a = input ("enter first number")
print a
b = input ("entre secound number")
print "addition", a+b
print "multiply", a*b
print ("close?")
text = raw_input ()
if text == "yes":
exit ()
if text == "no":

now at the end i want to loop back to the start if "no" is entered, but i can't seem to get it.
any advise?
many thanks!
Tim