import java.io.*; import java.util.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < n; i++) { int a = sc.nextInt(); long b = sc.nextInt(); int c = sc.nextInt(); int count = Integer.MAX_VALUE; int current = 0; while (a > 0) { count = Math.min(count, (a + c - 2) / (c - 1) + current); if (a % c == 0) { a /= c; current++; } else { a -= a % c; current++; } } count = Math.min(count, current); sb.append(count * b).append("\n"); } System.out.print(sb); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public String next() throws Exception { if (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }