#include<bits/stdc++.h>
using namespace std;

vector<int>a,b;
int main()
{
int n,k,sum1,sum2;
    cin>>n>>k;
    for(int i=1;i<=n;i++)
{
if(i%k==0)
{a.push_back(i);
sum1+=i;}
else
{b.push_back(i);
sum2+=i;}
}
   cout<<fixed<<setprecision(1)<<(double)sum1/a.size()<<" "<<(double)sum2/b.size();
return 0;
}