#include<stdio.h>
int main ()
{
	int n,k;
	scanf("%d %d",&n,&k);
	int i;
	int sum;
	sum=0;
	for(i=k;i<=n;i=i+k)
	{
		sum=sum+i;
	}
	int SUM;
	SUM=n*(n+1)/2;
	printf("%.1f %.1f",sum*k/n,(SUM-sum)/(n-(n/k)));
	return 0;
}