#include <bits/stdc++.h>
using namespace std;
int a, s, i = 1;
double d = 0,f = 0;
int main() {
	cin >> a >> s;
	while (i <= a) {
		
		if (i % s == 0) {
			d = d + i;
		} else {
			f = f + i;
		
		}
	i++;
	}
	cout<<fixed<<setprecision(1)<<d/a<<" "<<fixed<<setprecision(1)<<f/a;


	return 0;
}