#include<stdio.h>
int main()
{
	int i,n,k,j=0;
	int sum1=0,sum2=0;
	float aver1,aver2;
	scanf("%d%d",&n,&k);
	for(i=1;i<=n;i++)
	{
		if(i>=k&&i%k==0)
		{
			sum1=sum1+i;
			j++;
		}
		else
		sum2=sum2+i;
	}
	aver1=sum1/j;
	aver2=sum2/(n-j);
	printf("%.1f %.1f",aver1,aver2);
	return 0;
	
 }