





'''simple docstring'''

from math import ceil





def 						UpperCamelCase    (							_lowerCamelCase : int = 10_01	):
    A__    =      1

    for i in range(1						,	int(ceil(n / 2.0	)	)	):
        A__    =      2 * i + 1
        A__    =      2 * i
        A__    =      total + 4 * odd**2 - 6 * even

    return total


if __name__ == "__main__":
  import sys

  if len(sys.argv) == 1:
    print(solution())
  else:
    try:
      __lowerCAmelCase							:     Any		     =int(sys.argv[1])
      print(solution(n))
    except ValueError:
      print("Invalid entry - please enter a number")










'''simple docstring'''

def 						UpperCamelCase    (							_lowerCamelCase : int = 1_00_00_00	):
    A__    =      set(range(3						,	_lowerCamelCase						,	2	)	)
    primes.add(2	)
    for p in range(3						,	_lowerCamelCase						,	2	):
        if p not in primes:
            continue
        primes.difference_update(set(range(p * p						,	_lowerCamelCase						,	_lowerCamelCase	)	)	)

    A__    =      [float(_lowerCamelCase	) for n in range(limit + 1	)]

    for p in primes:
        for n in range(_lowerCamelCase						,	limit + 1						,	_lowerCamelCase	):
            phi[n] *= 1 - 1 / p

    return int(sum(phi[2:]	)	)


if __name__ == "__main__":
  print(f"""{solution() = }""")



