Table:
text: List of Olympic medalists in athletics (men)
Men's events
400 metres hurdles
Rank_ Athlete Nation Olympics Gold Silver Bronze Totalmin_2_medals
1 Edwin Moses Category:Articles with hCards United States (USA) 1976–1988 2 0 1 3
2 Morgan Taylor Category:Articles with hCards United States (USA) 1924–1932 1 0 2 3
3 Glenn Davis Category:Articles with hCards United States (USA) 1956–1960 2 0 0 2
3 Angelo Taylor Category:Articles with hCards United States (USA) 2000–2008 2 0 0 2
3 Felix Sanchez Category:Articles with hCards Dominican Republic (DOM) 2004–2012 2 0 0 2
6 Harry Hillman Category:Articles with hCards United States (USA) 1904–1908 1 1 0 2
6 Glenn Hardin Category:Articles with hCards United States (USA) 1932–1936 1 1 0 2

Question: What is the smallest amount of silver in the list of Olympic medalists in track and field (men's) 400 meter hurdles?