in total, how many athlete medal leaders are from the united states?
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col : athlete | nation | olympics | gold | silver | bronze | total row 1 : philipp schoch | switzerland (sui) | 2002–2006 | 2 | 0 | 0 | 2 row 2 : shaun white | united states (usa) | 2006–2014 | 2 | 0 | 0 | 2 row 3 : seth wescott | united states (usa) | 2006–2010 | 2 | 0 | 0 | 2 row 4 : karine ruby | france (fra) | 1998–2002 | 1 | 1 | 0 | 2 row 5 : hannah teter | united states (usa) | 2006–2014 | 1 | 1 | 0 | 2 row 6 : ross powers | united states (usa) | 1998–2002 | 1 | 0 | 1 | 2 row 7 : kelly clark | united states (usa) | 2002–2014 | 1 | 0 | 2 | 3 row 8 : danny kass | united states (usa) | 2002–2006 | 0 | 2 | 0 | 2
in total, how many athlete medal leaders are from the united states?
Athlete Nation Olympics Gold Silver Bronze Total
Philipp Schoch Switzerland (SUI) 2002–2006 2 0 0 2
Shaun White United States (USA) 2006–2014 2 0 0 2
Seth Wescott United States (USA) 2006–2010 2 0 0 2
Karine Ruby France (FRA) 1998–2002 1 1 0 2
Hannah Teter United States (USA) 2006–2014 1 1 0 2
Ross Powers United States (USA) 1998–2002 1 0 1 2
Kelly Clark United States (USA) 2002–2014 1 0 2 3
Danny Kass United States (USA) 2002–2006 0 2 0 2
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