#include<iostream>

using namespace std;
#define int long long

signed main(){

   int N, K;
   cin>> N>> K;

   if(N<=K){
      cout<< 1<< endl;
   }else{
      if(N%(K+1)==0){
         cout<< N/(K+1)+1<< endl;
      }else{
         cout<< (N+K+1-1)/(K+1)<< endl;
      }
   }

   return 0;
}