#include<bits/stdc++.h>

using namespace std;

int main()

{

int Asum=0,Bsum=0,n,k;

cin>>n>>k;

for(int i=k;i<=n;i+=k){

	Asum+=i;
}

Bsum=(n+1)*n/2-Asum;

printf("%.1lf",double(Asum)/(n/k));

printf("%.1lf",double(Bsum)/(n-n/k));

return 0; 
	}