<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following CIF representation:
data_Na2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.95
_cell_length_b   6.95
_cell_length_c   4.58
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   153.04
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2C
_chemical_formula_sum   'Na4 C2'
_cell_volume   100.28
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na2  1  0.62  0.35  0.43  1.0
  Na  Na3  1  0.62  0.58  0.43  1.0
  Na  Na4  1  0.62  0.42  0.14  1.0
  Na  Na5  1  0.62  0.65  0.14  1.0
  C  C0  1  0.62  0.85  0.43  1.0
  C  C1  1  0.62  0.15  0.14  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Na2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.95
_cell_length_b   6.95
_cell_length_c   4.58
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   153.04
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2C
_chemical_formula_sum   'Na4 C2'
_cell_volume   100.28
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na2  1  0.62  0.35  0.43  1.0
  Na  Na3  1  0.62  0.58  0.43  1.0
  Na  Na4  1  0.62  0.42  0.14  1.0
  Na  Na5  1  0.62  0.65  0.14  1.0
  C  C0  1  0.62  0.85  0.43  1.0
  C  C1  1  0.62  0.15  0.14  1.0

What is the crystal system of this material?