#include<bits/stdc++.h> 
using namespace std;
long long n,m,ans;
int main()
{
	cin>>n>>m;
	if(n>3*m) 
	{
		ans=ceil(n/m)/2;
		long long sl=ceil(n/m);
		n-=(sl-1)*floor(n/sl);
	}
	int i=1;
	cout<<(long long)(ceil(log(n)/log(3))+ans);
	return 0;
}