#include<bits/stdc++.h>
#pragma G++ optimize(1)
#pragma G++ optimize(2)
#pragma G++ optimize(3)
using namespace std;
int main()
{
	std::ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	int n,k;
	cin>>n>>k;
	double suma,sumb,cnta,cntb;
	double ansa,ansb;
	for(int i=1;i<=n;i++)
	{
		if(i%k==0)
		{
			suma+=i;
			cnta++;
		}
		else
		{
			sumb+=i;
			cntb++;
		}
	}
	ansa=suma*1.0/cnta;
	ansb=sumb*1.0/cntb;
	printf("%.1lf %.1lf",ansa,ansb);
	return 0;
}