CREATE TABLE "classification_leadership" (
  "stage" real,
  "winner" text,
  "general_classification" text,
  "mountains_classification" text,
  "sprint_classification" text,
  "team_classification" text
);

Question: What is the earliest stage where mountains classifications was awarded to Peter Stetina? 
SQL: SELECT MIN("stage") FROM "classification_leadership" WHERE "mountains_classification"='Peter Stetina';