#include <iostream>
#include <vector>
#include <iomanip>
#include <algorithm>
#include <map>
#include <cmath>
#include <bitset>
#include <string>
#include <queue>
#include <stack>
#include <set>
#include <tuple>
#include <atcoder/all>
#include <sstream> // std::stringstream
#include <regex>
#include <fstream>
using namespace atcoder;
using mint = modint998244353;
//using mint = modint1000000007;
using namespace std;
using ll = long long;
static const double pi = 3.141592653589793;
const int INF = (1 << 29);
const ll mod = 998244353;
// ifstream ifs(""); ファイルはワークスペースのトップにおく

map<ll,ll> mp;
ll h,a;

ll search(ll h){
    if(mp.find(h)!=mp.end()) return mp[h];
    if(h == 1) return 1;
    else if(h==0) return 1;
    mp[h] = 1+search(h/a) + search(h/a);
    return mp[h];
}

int main() {
    cin >> h >> a;
    mp[0] = 0;
    mp[1] = 1;
    ll ans = search(h);
    cout << ans << endl;
}