#include <bits/stdc++.h> #include<atcoder/all> #define rep(i,n) for(int i=0;i<n;i++) using namespace std; using namespace atcoder; #define all(a) a.begin(),a.end() typedef long long ll; typedef pair<ll,int> P; typedef vector<ll> vi; constexpr ll inf=1ll<<61; constexpr ll mod=998244353; typedef modint998244353 mi; int main(){ ll h,a;cin>>h>>a; ll ans=0,cnt=1; while(h){ h/=a; ans+=cnt; cnt<<=1; } cout<<ans<<endl; }