#include <iostream>
using namespace std;



int n,k;
int sum1,sum2;
int cnt1,cnt2;

int main() {
	cin>>n>>k;
	for(int i=1;i<=n;i++)
	{
		if(i%k==0)
		{
			sum1+=i;
			cnt1++;
		}
		else
		{
			sum2+=i;
			cnt2++;
		}
	}
	printf("%.1lf",double(sum1/cnt1));
	cout<<" ";
	printf("%.1lf",double(sum2/cnt2));


	
	

	return 0;
}