#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,k;
    double sum_1=0,sum_2=0;
    int count_1=0,count_2=0,ans1,ans2;
    cin>>n;
    cin>>k;
    for(int i=1;i<=n;i++){
        if(i%k==0){
            sum_1+=i;
            count_1++;
        }else{
            sum_2+=i;
            count_2++;
        }
    }
    ans1=sum_1/count_1;
    ans2=sum_2/count_2;
    printf("%.1lf %.1lf",ans1,ans2);
    return 0;
}