import ctypes
 
_sum = ctypes.CDLL('libsum.so')
_sum.sum_function.argtypes = (ctypes.c_int, ctypes.POINTER(ctypes.c_int))
 
def sum_function(numbers):
   global _sum
   num_numbers = len(numbers)
   array_type = ctypes.c_int * num_numbers
   result = _sum.sum_function(ctypes.c_int(num_numbers), array_type(*numbers))
   return int(result)