#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(ll i=0;i<n;i++)
static const int INF=1000000000;

int main(){
  ll n,k;
  cin>>n>>k;
  cout<<(n+k+1)/(k+1)<<endl;
  return 0;
}