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import math
def is_prime_number(x):
  for i in range(2, int(math.sqrt(x))+1):
    if x%i == 0:
      return False
  return True

n, m = map(int, input().split())
cnt = 0

for a in range(n, m+1):
  if is_prime_number(a):
    cnt += 1

print(cnt)

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