#include <iostream>
#include <map>
#include <functional>

using namespace std;

int main()
{
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    long long H, A, temp;
    int ans = 0;
    map<long long, int, greater<long long>> slimes;
    cin >> H >> A;
    slimes.emplace(H, 1);

    for (ans = 0; !slimes.empty(); ++ans)
    {
        temp = slimes.begin()->first / A;
        if (temp != 0)
            slimes[temp] += 2;
        slimes.erase(slimes.begin());
    }

    cout << ans << '\n';
    return 0;
}