# from collections import

def readints():
  return list(map(int, input().split()))

def main():
  N, = readints()
  A = readints()
  B = readints()
  print(sum(a <= b for a, b in zip(A, B)))


if __name__ == '__main__':
  # import sys
  # sys.setrecursionlimit(550000)
  # flush = lambda: sys.stdout.flush()
  main()