#include<iostream>
#include<iomanip>
using namespace std;

int main(){
	int n,k;
	double sum1=0,sum2=0,n1,n2;
	cin>>n>>k;
	for (int i=1;i<=n;i++){
		if(i%k==0){
			sum1+=i;
			n1++;
		}else{
			sum2+=i;
			n2++;
		}
	}
	cout<<fixed<<setprecision(1)<<sum1/n1<<" "<<sum2/n2;


	return 0;
	
}