What is the total of events when the tournament was U.S. Open and the Top-25 was less than 1?
CREATE TABLE table_50011 (
    "Tournament" text,
    "Wins" real,
    "Top-10" real,
    "Top-25" real,
    "Events" real,
    "Cuts made" real
)
SELECT SUM("Events") FROM table_50011 WHERE "Tournament" = 'u.s. open' AND "Top-25" < '1'
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 total of events when the tournament was U.S. Open and the Top-25 was less than 1? ### Input: CREATE TABLE table_50011 (
    "Tournament" text,
    "Wins" real,
    "Top-10" real,
    "Top-25" real,
    "Events" real,
    "Cuts made" real
) ### Response: SELECT SUM("Events") FROM table_50011 WHERE "Tournament" = 'u.s. open' AND "Top-25" < '1'