def calculatror(N):
if N % 2 == 0:
result = 1
for i in range(1, N):
result = result * i
else:
result = 0
for i in range(1, N):
result = result + i
return result
print(calculator(11))
ZGVmIGNhbGN1bGF0cm9yKE4pOgogICAgaWYgTiAlIDIgPT0gMDoKICAgICAgICByZXN1bHQgPSAxCiAgICAgICAgZm9yIGkgaW4gcmFuZ2UoMSwgTik6CiAgICAgICAgICAgIHJlc3VsdCA9IHJlc3VsdCAqIGkKICAgIGVsc2U6CiAgICAgICAgcmVzdWx0ID0gMAogICAgICAgIGZvciBpIGluIHJhbmdlKDEsIE4pOgogICAgICAgICAgICByZXN1bHQgPSByZXN1bHQgKyBpCiAgICAKICAgIHJldHVybiByZXN1bHQKCnByaW50KGNhbGN1bGF0b3IoMTEpKQ==