using System; using static System.Console; using System.Linq; using System.Collections.Generic; class Program { static int NN => int.Parse(ReadLine()); static long[] NList => ReadLine().Split().Select(long.Parse).ToArray(); public static void Main() { Solve(); } static void Solve() { var c = NList; var (h, a) = (c[0], c[1]); var ans = 0L; var cnt = 1L; while (h > 0) { ans += cnt; h /= a; cnt <<= 1; } WriteLine(ans); } }