#include <bits/stdc++.h>
using namespace std;

void query() {
    int a, b, c, x = -1;
    cin >> a >> b >> c;
    while (a) {
        if (a % c) x++;
        x++;
        a /= c;
    }
    cout << (long) b * x << "\n";
}

int main()
{
    int q;
    cin >> q;
    for (int i = 0; i < q; i++) {
        query();
    }
}