#include <stdio.h>
#include <string>
#include <cstring>
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <iterator>
#include <assert.h>
#pragma warning(disable:4996) 
 
typedef long long ll;
#define MIN(a, b) ((a)>(b)? (b): (a))
#define MAX(a, b) ((a)<(b)? (b): (a))
#define LINF 9223300000000000000
#define INF 2140000000
const long long MOD = 1000000007;
//const long long MOD = 998244353;
using namespace std;

int main(int argc, char* argv[])
{
    int Q;
    scanf("%d", &Q);
    int q;
    for(q=0; q<Q; q++) {
        int a,b,c;
        scanf("%d%d%d", &a, &b, &c);

        if(c==1) {
            printf("%lld\n", (ll)a*b);
        }
        else {
            vector<int> z;
            int curr=a;
            int cnt=0;
            while(curr) {
                z.push_back(curr%c);
                if(curr%c) cnt++;
                curr/=c;
                cnt++;
            }
            if(z[(int)z.size()-1]==1) cnt--;
            printf("%lld\n", (ll)(cnt-1)*b);
        }
    }

    return 0;
}