#include<bits/stdc++.h>
using namespace std;
int main(){
	double n,k,sum=0;
	cin>>n>>k;
	for(int i=k;i<=n;i+=k)
	{
		sum+=i;
	} 
	printf("%.1f ",sum/(n/k));
	sum=(1+n)*n/2-sum;
	printf("%.1f\n",sum/(n-n/k));
	return 0;
}