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Omni-MATH / The number 123 is shown on the screen of a computer. Each minute the computer adds 102 to the number on the screen. The computer expert Misha may change the order of digits in the …

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problem

The number 123123 is shown on the screen of a computer. Each minute the computer adds 102102 to the number on the screen. The computer expert Misha may change the order of digits in the number on the screen whenever he wishes. Can he ensure that no four-digit number ever appears on the screen? (F.L. Nazarov, Leningrad)
Plain-text mathematical notation (without MathML)
The number 123 is shown on the screen of a computer. Each minute the computer adds 102 to the number on the screen. The computer expert Misha may change the order of digits in the number on the screen whenever he wishes. Can he ensure that no four-digit number ever appears on the screen?

(F.L. Nazarov, Leningrad)
Original LaTeX notation
The number $123$ is shown on the screen of a computer. Each minute the computer adds $102$ to the number on the screen. The computer expert Misha may change the order of digits in the number on the screen whenever he wishes. Can he ensure that no four-digit number ever appears on the screen?

(F.L. Nazarov, Leningrad)

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