#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,k;
    int sum;
    scanf("%d%d",&n,&k);
    for(int i=k;i<=n;i+=k)
        sum+=i;
    printf("%.1f ",double(sum)/(n/k));
    sum=(1+n)*n/2-sum;
    printf("%.1f",double(sum)/(n-n/k));
    return 0;
}