#include<bits/stdc++.h>
using namespace std;
double a,a1,b1,b;
int main(){
	int n,k;
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		if(!i%k) a+=i,a1++;
		else b+=i,b1++;  
	}
	printf("%0.1f %0.1f",a/a1,b/b1);
}

awsl