20. Reimu invented a new number base system that uses exactly five digits. The number 0 in the decimal system is represented as 00000, and whenever a number is incremented, Reimu finds the leftmost digit (of the five digits) that is equal to the "units" (rightmost) digit, increments this digit, and sets all the digits to its right to 0. (For example, an analogous system that uses three digits would begin with 000, 100, 110, 111, 200, 210, 211, 220, 221, 222, 300, . . ..) Compute the decimal representation of the number that Reimu would write as 98765.