What is the minimum stage where Sergei Smetanine won?
CREATE TABLE table_19857 (
    "Stage" real,
    "Winner" text,
    "General classification" text,
    "Points classification" text,
    "Mountains classification" text,
    "Combination classification" text,
    "Team classification" text
)
SELECT MIN("Stage") FROM table_19857 WHERE "Winner" = 'Sergei Smetanine'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the minimum stage where Sergei Smetanine won? ### Input: CREATE TABLE table_19857 (
    "Stage" real,
    "Winner" text,
    "General classification" text,
    "Points classification" text,
    "Mountains classification" text,
    "Combination classification" text,
    "Team classification" text
) ### Response: SELECT MIN("Stage") FROM table_19857 WHERE "Winner" = 'Sergei Smetanine'