#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;
#ifdef _WIN32
#include <Windows.h>
#endif

int main()
{
    long long n, k;
    cin >> n >> k;
    cout << ((!(n%(k+1))) ? n/(k + 1) : n/(k + 1) + 1) << endl;
}