#include <iostream>
#include <queue>

using namespace std;

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

    long long H, A, temp;
    int ans = 0;
    queue<long long> slimes;
    cin >> H >> A;
    slimes.push(H);

    for (ans = 0; !slimes.empty(); ++ans)
    {
        slimes.front() /= A;
        if (slimes.front() != 0)
            slimes.push(slimes.front()), slimes.push(slimes.front());
        slimes.pop();
    }

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