def add(a,b):
    print"ADDING %d+%d" % (a,b)
    return a+b
#return 반환하다.
def subtract(a,b):
    print"SUBTRACTING %d - %d" %(a,b)
    return a-b
def multiply(a,b):
    print"MULTIPLYING %d * %d" %(a,b)
    return a*b
def divide(a,b):
    print"DIVIDING %d / %d" %(a,b)
    return a/b

print "Let's do some math with just function"

age=add(30,5)
height=subtract(78,4)
weight=multiply(90,2)
iq=divide(100,2)

print"Age:%d,Height: %d,weight:%d,IQ:%d" %(age,height,weight,iq)

print "Here is a puzzle."

what = add(age,subtract(height,multiply(weight,divide(iq,2))))

print"That becomes:",what,"can you do it by hand?"