Answer: 25.
- John Adams
- Thomas Jefferson
- James Monroe
- John Quincy Adams
- Andrew Jackson
- Martin Van Buren
- John Tyler
- James Polk
- Millard Fillmore
- Franklin Pierce
- James Buchanan
- Abraham Lincoln
- Rutherford Hayes
- Chester Arthur
- Grover Cleveland
- Benjamin Harrison
- William McKinley
- William Taft
- Woodrow Wilson
- Calvin Coolidge
- Franklin Roosevelt
- Richard Nixon
- Gerald Ford
- Bill Clinton
- Barack Obama
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