There's a three-digit number written on the whiteboard. Mr. Dmitrii multiplied its first digit by 7, multiplied its second digit by 17, and multiplied its third digit by 71. Then he calculated the sum

There's a three-digit number written on the whiteboard. Mr. Dmitrii multiplied its first digit by 7, multiplied its

second digit by 17, and multiplied its third digit by 71. Then he calculated the sum of the three products and
got his initial number! What is the number?
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20

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