#include<bits/stdc++.h>
using namespace std;
int n,k,cnt1=0,cnt2=0;
double ans1,ans2,sum1,sum2;

int main(){
	cin>>n;
	cin>>k;
	for(int i=1;i<=n;i++) {
		if(i%k==0){
			sum1+=i;
			cnt1++;
		}
		else{
			sum2+=i;
			cnt2++;

		}
		ans1=sum1/cnt1;
		ans2=sum2/cnt2;
		
		printf("%.1lf %.1lf",ans1,ans2);
		return 0;
		
		
	
	}
}