#include<stdio.h>
int main()
{
	int n,k,a[1001],b[1001];
	int sum1=0;
	int sum2=0;
	int i=1;
	int j=1;
	int m=1;
	scanf("%d %d",&n,&k);
	for(m=1;m<=n;m++)
	{
		if(m%k==0)
		a[i]=m;
		i++;
		sum1=sum1+a[i];
		if(m%k!=0)
		b[j]=m;
		j++;
		sum2=sum2+b[j];
	}
    double aver1,aver2;
     aver1=sum1/i;
     aver2=sum2/j;
     printf("%.1f %.1f",aver1,aver2);
	
	return 0;
}