import java.util.*;

public class Main {
    public static void main(String[]  args) {
        Scanner sc = new Scanner(System.in);
        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();
            long total = 0;
            while (a >= 2 * c) {
                if (a % c != 0) {
                    total++;
                    a = a / c * c;
                } else {
                    a /= Math.min(c, a / c);
                    total++;
                }
            }
            if (a >= c) {
                total += 2;
            } else {
                total++;
            }
            sb.append(total * b).append("\n");
        }
        System.out.println(sb);
    }
}