Find the number of papers published by the institution 'University of Pennsylvania'.
CREATE TABLE authorship (
    paperid VARCHAR,
    instid VARCHAR
)

CREATE TABLE inst (
    instid VARCHAR,
    name VARCHAR
)

CREATE TABLE papers (
    title VARCHAR,
    paperid VARCHAR
)
SELECT COUNT(DISTINCT t1.title) FROM papers AS t1 JOIN authorship AS t2 ON t1.paperid = t2.paperid JOIN inst AS t3 ON t2.instid = t3.instid WHERE t3.name = "University of Pennsylvania"
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: Find the number of papers published by the institution 'University of Pennsylvania'. ### Input: CREATE TABLE authorship (
    paperid VARCHAR,
    instid VARCHAR
)

CREATE TABLE inst (
    instid VARCHAR,
    name VARCHAR
)

CREATE TABLE papers (
    title VARCHAR,
    paperid VARCHAR
) ### Response: SELECT COUNT(DISTINCT t1.title) FROM papers AS t1 JOIN authorship AS t2 ON t1.paperid = t2.paperid JOIN inst AS t3 ON t2.instid = t3.instid WHERE t3.name = "University of Pennsylvania"