#define _CRT_SECURE_NO_WARNINGS 
#include<stdio.h>
int main()
{
	int n, k,a1=0,a2=0;
	float sum1=0,sum2=0;
	scanf("%d%d", &n, &k);
	for (int i = 1; i <= n; i++)
	{
		if (i % k == 0)
		{
			a1++;
			sum1 += i;
		}
		else if(i%k!=0)
		{
			a2++;
			sum2 += i;
		}
	}
	printf("%.1f %.1f",sum1/a1,sum2/a2);
	return 0;
}