#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
using T = tuple<ll, ll, ll>;
// #include <atcoder/all>
// using namespace atcoder;
// using mint = modint1000000007;
#define rep(i, n) for(ll i = 0; i < n; i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    ll h,a; cin >> h >> a;
    map<ll,ll> memo;
    auto dfs = [&](auto self, ll now) -> ll {
        if( now == 0 ) return 0ll;
        if( memo.count(now) ) return memo[now];
        memo[now]++;
        memo[now] += self(self,now/a) * 2;
        return memo[now];
    };
    dfs(dfs,h);
    cout << memo[h] << endl;
    
    return 0;
}