13742번 - Base Sums

Given three values n, a, and b, find the smallest m>n such that the sum of the digits of m in base a is the same as the sum of digits of m in base b.

Each input will consist of a single test case. Note that your program may be run multiple times on different inputs. There will be a single line of input, with three integers, n (0 ≤ n ≤ 10¹⁶), a and b (2 ≤ a < b ≤ 36), all of which will be in base 10.

Output a single integer, m, which is the smallest number greater than n such that the sum of its digits in base a is the same as the sum of its digits in base b. Output m in base 10.