#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<windows.h>
const int N=2;
int n,k,a[N],y,z=0;
double f,g;
int main(){
	std::cin>>n>>k;
	for(int i=1;i<=n;++i){
		if(i%k==0) {y++; f+=i;}
		if(i%k!=0) {z++; g+=i;}
	}
	printf("%.1lf %.1lf",f/y,g/z);
	return 0;
}