#include<stdio.h>
int main()
{
	int n, k, i, a[10000];
	float	sum1=0,sum2=0;
	scanf("%d %d", &n, &k);
	int p = 0;
	for (i = 0; i < n; i++)
	{	
		a[i] = i + 1;
		if (a[i] % k == 0)
		{
			sum1 = sum1 + a[i];
			p++;
		}
	}
	sum1 = sum1 / p;
	p = 0;
	for (i = 0; i < n; i++)
	{
		a[i] = i + 1;
		if (a[i] % k != 0)
		{
			sum2 = sum2 + a[i];
			p++;
		}
	}
	sum2 = sum2 / p;
	printf("%.1f %.1f\n", sum1, sum2);
	return 0;
}