#include<bits/stdc++.h>
using namespace std;
int n,k,ans=0,ans1=0,num=0,num1=0;
int main(){
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		if(i%k==0){
			ans++;
			ans1+=i;
		}else{
			num++;
			num1+=i;
		}
	}
	double a,b;
	a=double(ans1/ans);
	b=double(num1/num);
	printf("%.1lf %.1lf",a,b);
	return 0;
}