When 4 is the v-band what is the overall amount of ka-bands?
{'header': ['Property', 'K-band', 'Ka-band', 'Q-band', 'V-band', 'W-band'], 'page_title': 'Wilkinson Microwave Anisotropy Probe', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'text', 'text'], 'id': '1-186468-1', 'section_title': 'Spacecraft', 'caption': 'Properties of WMAP at different frequencies', 'rows': [['Central wavelength (mm)', '13', '9.1', '7.3', '4.9', '3.2'], ['Central frequency ( GHz )', '23', '33', '41', '61', '94'], ['Bandwidth (GHz)', '5.5', '7.0', '8.3', '14.0', '20.5'], ['Beam size (arcminutes)', '52.8', '39.6', '30.6', '21', '13.2'], ['Number of radiometers', '2', '2', '4', '4', '8'], ['System temperature ( K )', '29', '39', '59', '92', '145']], 'name': 'table_186468_1'}