enter = raw_input('Input a starting and ending number: ')
enter = enter.split()
start = int(enter[0])
end = int(enter[1])

limit = end + 1

if start == 0 or start == 1:
    start = 2

i, list_a = start, []
while i < limit:
    list_a.append(i)
    i += 1

i = 0
while i < len(list_a):
    j = i + 1
    while j < len(list_a):
            if list_a[j] % list_a[i] == 0:
                del list_a[j]
                j -= 1
            j += 1
    i += 1

ending = str(start) + " and " + str(end) + " is: " + str(len(list_a))
print "The number of primes between " + ending