import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long K = sc.nextLong();
        long ans = 0;
        long D = K+1;
        if(N%D==0){
            ans=N/D;
        }else{
            ans=N/D+1;
        }
        if(ans==0)ans=1;
        System.out.println(ans);
    }
}