#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
#include<iomanip>
#include<queue>
using namespace std;
typedef long long int lint;
int main() {
	lint N, K;
	cin >> N >> K;
	if (!(N % (K + 1))) {
		cout << (N / (K + 1)) + 1 << endl;
	}
	else {
		cout << (N + K) / (K + 1) << endl;
	}
}