rt

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<queue>
using namespace std;
long long n,k,ans,sum,d,SUM,ANS,D; 
int main()
{
	cin>>n>>k;
	for(int i=1;i<=n;i++)
	{
		if(i%k==0)
		{
			sum+=i;
			ans++;
		}
		else
		{
		   SUM+=i;
		   ANS++;	
		}
		
	}
    d=sum/ans;
    D=SUM/ANS;
    printf("%0.1f",d);
    cout<<" "; 
    printf("%0.1f",D);
    
}