Problem 424

4. A group has 48 members, but only half of them

have uniforms. During a certain inspection ceremony, they formed a $6 \times 8$ rectangular array, which exactly hid the members without uniforms inside the array. Later, more members joined, but the total still had half without uniforms. During the next inspection ceremony, they formed a different rectangular array, which again exactly hid the members without uniforms inside the array. Then the number of new members is $\qquad$ people.