On the board is written in decimal the integer positive number N. If it is not a single digit number, wipe its last digit c and replace the number m that remains on the board with a number m−3c. (For example, if N=1,204 on the board, 120−3⋅4=108.) Find all the natural numbers N, by repeating the adjustment described eventually we get the number 0. combinatoricsgameDigitsDigit