Use the ten numbers 0, 1, 2, ..., 9 to form a four-digit number, a three-digit number, a two-digit number and a one-digit number. Each number is only allowed once, so that the sum of these four numbers is equal to 2007, what is the minimum value of the three digits
用0，1，2，…，9这十个数字组成一个四位数，一个三位数，一个两位数与一个一位数，每个数字只许用一次，使这四个数的和等于2007，则其中三位数的最小值是多少
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