#include<bits/stdc++.h>
using namespace std;

int main() {
	int n, k;
	int Asum = 0, Bsum = 0;
	scanf("%d%d", &n, &k);
	for (int i = k; i <= n; i += k)
		Asum += i;
	Bsum = (1 + n) * n / 2 - Asum;
	printf("%.1f", double(Asum) / (n / k));
	printf("%.1f\n", double(Bsum) / (n - n / k));
	return 0;
}