#include <stdio.h>
int main()
{
	int k, n,count1=0,count2=0,sum1=0,sum2=0,count;
	double average1, average2;
	scanf("%d %d", &n, &k);
	int C = k;
	while (C <= n)
	{
		if (C % k == 0)
		{
			sum1 += C;
			count1++;
		}
		else
		{
			sum2 += C;
			count2++;
		}
		C++;
	}
	average1 = sum1 / count1;
	for (count = 1; count <= (k - 1); count++)
	{
		sum2 += count;
	}
	average2 = sum2 / (count2+k-1);
	printf("%.1f %.1f", average1, average2);
	return 0;
	}

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