If a multi-digit number is equal to the sum of its digits plus the product of each digit, then the multi-digit number is called a lucky number, then: How many lucky numbers are there that are less than 1000?
如果一个多位数等于它的各位数字之和加上各位数字之积，则称这个多位数为幸运数，则：小于1000的幸运数有多少个．
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