package Implementation;
import java.util.Scanner;
/*
* @author -- rajatgoyal715
*/
public class LisaWorkbook {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int k=sc.nextInt();
int t[]=new int[n];
for(int i=0;i=s&&page<=s+k-1)
count++;
s+=k;
page++;
}
if(t[i]%k!=0){
if(page>=s&&page<=t[i])
count++;
page++;
}
}
System.out.println(count);
}
}