There are several plastic numbers 1, 2, and 3 in the cloth bag. Choose 6 numbers to add each time. At least how many times you choose to ensure that the sum of the two additions is equal.
布袋中装有塑料数字1、2、3各若干个，每次任选6个数字相加，至少选多少次才能保证有两个相加的和相等．
<result>14</result>