How many vacant seats were filled by newcomer Joseph H. Bottum (r)?
{'header': ['State (class)', 'Vacator', 'Reason for change', 'Successor', 'Date of successors formal installation'], 'page_title': '', 'section_title': '', 'caption': '', 'rows': [['New Hampshire (2)', 'Styles Bridges (R)', 'Died November 26, 1961', 'Maurice J. Murphy, Jr. (R)', 'January 10, 1962'], ['Kansas (2)', 'Andrew F. Schoeppel (R)', 'Died January 21, 1962', 'James B. Pearson (R)', 'January 31, 1962'], ['South Dakota (3)', 'Francis H. Case (R)', 'Died June 23, 1962', 'Joseph H. Bottum (R)', 'July 9, 1962'], ['Idaho (2)', 'Henry Dworshak (R)', 'Died July 23, 1962', 'Leonard B. Jordan (R)', 'August 6, 1962'], ['Massachusetts (1)', 'Benjamin A. Smith II (D)', 'Successor elected November 6, 1962', 'Ted Kennedy (D)', 'November 7, 1962'], ['New Mexico (1)', 'Dennis Chavez (D)', 'Died November 18, 1962', 'Edwin L. Mechem (R)', 'November 30, 1962']]}