Find the angular speed of the system just after the clay strikes and sticks to the surface of the cylinder.?

ok so the question says: A wad of sticky clay of m m = 5.0 g and velocity i = 102 m/s is fired at a solid cylinder of m M = 15.0 kg and radius R = 25 cm (see figure). The cylinder is initially at rest and is mounted on a fixed horizontal axle that runs through its center of m. The line of motion of the projectile is perpendicular to the axle and at a distance d = 21 cm, less than R, from the center.