There are enough stamps of 8 cents and 15 cents. It is impossible to make up a certain postage amount such as 7 cents and 29 cents. Remember that the maximum amount that cannot be made up is n, that is, any amount greater than n can be made up, then n = how much.
8分和15分的邮票足够多，某邮资额数例如7分、29分不可能刚好凑成，记不能凑成的最大额数为n，即大于n的额数都可以凑成，则n=多少．
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