#include <stdio.h>
#include <iostream>
using namespace std;
int main(){
	int n,k,a,b;
	double A,B;
	cin >> n >> k;
	for (int i = 1; i <=n;i++){
		if (i%k==0){
			A += i;
			a++;
		}
		else{
			B += i;
		}
	}
	b=n-a;
	printf("%.1lf %.1lf",A/a,B/b);
	return 0;
}