text: #!/usr/bin/env python3
  # from typing import *
  
  YES = 'YES'
  NO = 'NO'
  
  # def solve(N: int, A: List[int]) -> str:
  def solve(N, A):
      pass  # TODO: edit here
  
  # generated by online-judge-template-generator v4.6.0 (https://github.com/kmyk/online-judge-template-generator)
  def main():
      import sys
      tokens = iter(sys.stdin.read().split())
      N = int(next(tokens))
      A = [None for _ in range(N)]
      for i in range(N):
          A[i] = int(next(tokens))
      assert next(tokens, None) is None
      a = solve(N, A)
      print(a)
  
  if __name__ == '__main__':
      main()
  