#include<bits/stdc++.h>
using namespace std;

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

    long double H, A;
    cin >> H >> A;

    uint64_t ans = 1ULL;
    H = floor(H/A);
    while (H > 0){
        H = floor(H/A);
        ans += 1ULL;
    };

    ans = 1ULL << ans;
    ans -= 1ULL;

    cout << ans << '\n';


    return 0;
}