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

int main() {
	double ev1, ev2, cnt1 = 0, cnt2 = 0;
	int n, k;
	cin >> n >> k;
	for (int i = 1; i <= n; i++) {
		if (i % k == 0) {
			cnt1++;
			ev1 += i;
		} else {
			cnt2++;
			ev2 += i;
		}
	}
	ev1 /= cnt1;
	ev2 /= cnt2;
	printf("%.1f", ev1);
	cout<<" ";
	printf("%.1f", ev2);
	return 0;
}