#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,k;
    int cut_a=0,cut_b=0;
    double sum_a=0,sum_b=0;
    cin>>n>>k;
    for(int i=1;i<=n;i++){
        if(i%k==0){
            sum_a+=i;
            cut_a++;
        }
        else{
            sum_b+=i;
            cut_b++;
        }
    }
    printf("%.1lf %.1lf",sum_a/cut_a,sum_b/cut_b);    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,k;
    int cut_a=0,cut_b=0;
    double sum_a=0,sum_b=0;
    cin>>n>>k;
    for(int i=1;i<=n;i++){
        if(i%k==0){
            sum_a+=i;
            cut_a++;
        }
        else{
            sum_b+=i;
            cut_b++;
        }
    }
    printf("%.1lf %.1lf",sum_a/cut_a,sum_b/cut_b);    return 0;
}