Translate the following question to SQL: How many perpetrators are there?

Schema: CREATE TABLE perpetrator (
    Perpetrator_ID INT   PRIMARY KEY,
    People_ID INT,
    Date TEXT,
    Year REAL,
    Location TEXT,
    Country TEXT,
    Killed INT,
    Injured INT,
    UNIQUE (Perpetrator_ID),
    FOREIGN KEY (People_ID) REFERENCES people(People_ID)
);

CREATE TABLE people (
    People_ID INT   PRIMARY KEY,
    Name TEXT,
    Height REAL,
    Weight REAL,
    Home Town TEXT,
    UNIQUE (People_ID)
);
user
SELECT count(*) FROM perpetrator
assistant