What is the number of races that took place with points of 257?
CREATE TABLE table_34902 (
    "Driver" text,
    "Points" real,
    "Season" text,
    "Races" real,
    "Percentage of possible points" text
)
SELECT SUM("Races") FROM table_34902 WHERE "Points" = '257'
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 number of races that took place with points of 257? ### Input: CREATE TABLE table_34902 (
    "Driver" text,
    "Points" real,
    "Season" text,
    "Races" real,
    "Percentage of possible points" text
) ### Response: SELECT SUM("Races") FROM table_34902 WHERE "Points" = '257'