#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
typedef long long ll;
ll n,k;
int main()
{
	cin>>n>>k;
	ll t=0;
	ll sum=n;
	ll count=1;
	while(sum-count>0)
	{
		ll x=count*k;
		count+=x;
		t++;
	}
	cout<<t<<endl;
	return 0;
}