#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    int time = 0, computers = 1, n, k, shnurs = 1;
    cin >> n >> k;
    if (k >= n)
    {
        while (pow(2, time) < n)
        {
            time += 1;
        }
        cout << time << endl;
    }
    if (k < n)
    {
        while (shnurs < k)
        {
            time += 1;
            computers += shnurs;
            shnurs += shnurs;
        }
        shnurs = k;
        if ((n - computers) % k == 0)
        {
            time = time + (n - computers) / k;
        }
        else
            time = time + (n - computers) / k + 1;
        cout << time;
    }
    return 0;
}