new_contents: import sys
  
  def sum_elements(arr):
      """ Return sum of array elements. """
      return sum(arr)
  
  
  if __name__ == '__main__':
      n = int(sys.stdin.readline())
      arr = map(int, sys.stdin.readline().strip().split(' '))
  
      print sum_elements(arr)
  
  
subject: solve Warmup/A Very Big Sum problem