#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>

using namespace std;

#define int long long
#define endl "\n"

const long long INF = (long long)1e18;
const long long MOD = 1'000'000'007; 

string yn(bool f){return f?"Yes":"No";}
string YN(bool f){return f?"YES":"NO";}



signed main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);
	
	int Q;
	
	cin>>Q;
	
	for(int i = 0; i < Q; i++){
		int N, K;
		int con = 0, num = 1;
		
		cin>>N>>K;
		
		if(K == 1) {
			cout<<N-1<<endl;
			continue;
		}
		
		for(;N > num; con++){
			num *= K;
		}
		
		cout<<con<<endl;
		
	}
	
	
	return 0;
}