#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=2e9+1;
const ll INF=4e18;
const ll dy[8]={-1,0,1,0,1,1,-1,-1};
const ll dx[8]={0,-1,0,1,1,-1,1,-1};
template <typename T> inline bool chmax(T &a, T b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> inline bool chmin(T &a, T b) {
  return ((a > b) ? (a = b, true) : (false));
}
map<ll,ll> mp;
ll b,c;
ll dfs(ll a){
  if(a==0)return 0;
  if(mp.count(a))return mp[a];
  ll ans=INF;
  chmin(ans,(a+c-2)/(c-1));
  if(a%c==0)chmin(ans,dfs(a/c)+1);
  else chmin(ans,dfs(a-(a%c))+1);
  mp[a]=ans;
  return ans;
}
void solve(){
  ll a;cin >> a >> b >> c;
  if(c==1){
    cout << -1 << endl;return;
  }
  mp.clear();
  cout << dfs(a)*b << endl;
  //for(auto p:mp)cout << p.first <<" " << p.second << endl;
}
int main(){
  ll q;cin >> q;
  while(q--)solve();
}