import java.util.Scanner;
class Main{
    public static void main(String[] args){
        Scanner s=new Scanner(System.in);
        int n,k;
        n=s.nextInt();
        k=s.nextInt();
        float sum1=0,sum2=0,c=0,j=0;
        for(int i=1;i<=n;i++){
            if(i%k==0){
                sum1+=i;
                c++;
            }else{
                sum2+=i;
                j++;
            }
        }
        float ans1=sum1/c;
        float ans2=sum2/j;
        System.out.printf("%.1f %.1f",ans1,ans2);
    }
}