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

vector<long long> divisor(long long n) {
    vector<long long> ret;
    for (long long i = 1; i * i <= n; i++) {
        if (n % i == 0) {
            ret.push_back(i);
            if (i * i != n) ret.push_back(n / i);
        }
    }
    sort(ret.begin(), ret.end()); // 昇順に並べる
    return ret;
}

int main(){
	
	long long  h, a;
	cin >> h >> a;

	long long res = 0, ans = 1, now = 1;
	h /= a;
	while(h > 0){
		h /= a;
		res += now * 2;
		now++;
	}
	
	cout << ans + res << endl;


}