#include<bits/stdc++.h>

using namespace std;

int main(){
    int n,k;
    scanf("%d%d",&n,&k);
    int Asum = 0,Bsum = 0;
    cin>>n>>k;
    for(int i=k;i<=n;i+=k)
        Asum+=i;
    Bsum = (1+n)*n/2-Asum;
    printf("%.1lf",double(Asum)/(n/k));
    printf("%.1lf",double(Bsum)/(n-n/k));
    return 0;
}