#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001
map<long long,long long> mp;
long long x,z;
long long ans = Inf64;
long long get(long long y){
	
	if(y<=x)return abs(y-x);
	if(y<=1)return abs(y-x);
	if(mp.count(y))return mp[y];
	
	long long ret = abs(x-y);
	if(ret>=ans)return ret;
	long long r = y%z;
	if(r==0){
		ret = min(ret,get(y/z)+1);
	}
	else{
		ret = min(ret,get(y/z)+1+r);
		ret = min(ret,get(y/z+1)+1+(z-r));
	}
	mp[y] = ret;
	return ret;
}

int main(){
	
	int _t;
	cin>>_t;
	
	rep(_,_t){
		long long y;
		cin>>x>>y>>z;
		long long ans = Inf64;
		rep(i,61){
			mp.clear();
			ans = min(ans,get(y)+i);
			if(x==0)break;
			x /= z;
		}
		cout<<ans<<endl;
	}
	
	return 0;
}