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