Untitled

def main():
    a=0
    counter=0
    b=0
    while a==0:
        inp = input("Enter a grade:")
        inp
        if inp>100 :
            print "too high"
        if inp < 0:
            print "too low"
        else:
            counter = counter+1
            b=inp+b
        if b == 999:
            a=1
    print 999/counter
main()