#include <bits/stdc++.h>
using namespace std;
int main(){
  int n,k;
    double sum1=0,sum2=0,ans1=0,ans2=0;
    cin>>n,k;
    for(int i=1;i<=n;i++)
    {
        if(i/k==0) {
            sum1+=i;
            ans1++;
        }
        else 
        {
            sum2+=i;
            ans2++;
        }
    }
    cout<<fixed<<setprecision(1)<<sum1/ans1<<" "<<sum2/ans2;
    return 0;
}