#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
using namespace std;

int main(){

  long long int n, k;
  cin >> n >> k;

  long long int ans = n / (k+1);

  cout << ( n % (k+1) == 0 ? ans : ans+1) << endl;

  return 0;
}