#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ll long long
#define OO 2'000'000'000
#define ull unsigned long long
#define nl '\n'
#define sz(x) (ll)(x.size())
#define all(x) x.begin(),x.end()
#define rall(s)  s.rbegin(), s.rend()
#define getline(s) getline(cin>>ws,s)
#define ceill(n, m) (((n) / (m)) + ((n) % (m) ? 1 : 0))
#define pi  3.141592653589793
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define multi_ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>


void Fast_IO(){
ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
// freopen("filename.in", "r", stdin);
// freopen("filename.txt", "w", stdout);
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}




int dx[] = { 2, 1, -1, -2, -2, -1, 1, 2 };
int dy[] = { 1, 2, 2, 1, -1, -2, -2, -1 };

ll fast_pow(ll base,ll power){
    ll res = 1;
    while(power){
        if(power&1) res = (res*base);
        base = (base*base);
        power >>= 1;
    }
    return res;
}


void solve(){
ll n,k; cin>>n>>k;
if(k==1){
    cout<<n<<nl;
    return;
}
vector<ll> v;
for(int i=0;i<n;i++){
    ll tmp = fast_pow(k,i);
    if( tmp>2*n) break;
    v.push_back(tmp);
}
ll ans = 0;
for(int i=0;i<sz(v);i++){
    if(v[i]<=n) ans+=(v[i]/2)+1;
    else{
        ll tmp = n - (v[i]-n);
        ans+=(tmp/2)+1;
    }
}
cout<<ans<<nl;




}

int main(){
    Fast_IO();
int t =1;
//cin>>t;
while(t--){
solve();
}
return 0;
}