output_description: Print the number of prime numbers in the given list.
input_description: The first line contains an integer _N_ , the number of elements in the list.
  
  _N_ numbers are given in the following lines.
attempt: n = int(input())
  a = []
  for i in range(1, n - 1):
      a[i] = int(input())
  
problem_description: Prime Numbers
  
  A prime number is a natural number which has exactly two distinct natural
  number divisors: 1 and itself. For example, the first four prime numbers are:
  2, 3, 5 and 7.
  
  Write a program which reads a list of _N_ integers and prints the number of
  prime numbers in the list.
samples: [{"input": "5\n    2\n    3\n    4\n    5\n    6", "output": "3"}, {"input": "11\n    7\n    8\n    9\n    10\n    11\n    12\n    13\n    14\n    15\n    16\n    17", "output": "4"}]