Which grid is the highest and has a time/retired of +0.3?
CREATE TABLE table_54221 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT MAX("Grid") FROM table_54221 WHERE "Time/Retired" = '+0.3'
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: Which grid is the highest and has a time/retired of +0.3? ### Input: CREATE TABLE table_54221 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT MAX("Grid") FROM table_54221 WHERE "Time/Retired" = '+0.3'