#include <iostream>
#include <cstdio>
using namespace std;
int main() {
	int n, k;
	scanf("%d %d", &n, &k);
	int ans1 = 0, num1 = 0, ans2 = 0, num2 = 0;
	for (int i = 1; i <= n; i++) {
		if (i % k == 0) {
			ans1 += i;
			num1++;
		} else {
			ans2 += i;
			num2++; 
		}
	}
	printf("%.1f ", double(ans1/num1)); 
	printf("%.1f\n", double(ans2/num2));
	return 0;
} 

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