mysql create function

Ali bi mi kdo znal pomagati pri tem sql queryju, ki mi nagaja. Problej je nekje pri deklaraciji input parametrov in sicer je syntak error. Hvala

CREATE FUNCTION haversine (l1 float, o1 float, l2 float, o2 float) RETURNS INT
DETERMINISTIC
BEGIN
l1 = RADIANS(l1);
l2 = RADIANS(l2);
o1 = RADIANS(o1);
o2 = RADIANS(o2);

DECLARE distance INT;
SET distance = (7926-26*SIN(l1))*ASIN(MIN(1,0.707106781186548*SQRT((1-(SIN(L2)*SIN(l1))-COS(l1)*COS(l2)*COS(o2-o1))))));

RETURN distance;
END