#include <stdio.h>

int main() {
	int n, k;
	int q, p = 0;
	scanf("%d %d", &n, &k);
	int a[n + 1];
	int b, c = 0;
	for (int i = 1; i <= n + 1; i++) {
		a[i] = i;
	}
	for (int i = 1; i <= n; i++) {
		if (a[i] % k == 0) {
			b = a[i] + b;
			q++;
		} else {
			c = a[i] + c;
			p++;
		}
	}
	double x = b / (q * 1.0);
	double y = c / (p * 1.0);
	printf("%.1f %.1f", x, y);
	return 0;
}