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