#include<bits/stdc++.h>
int main() {
	int n,k;
	scanf("%d %d",&n,&k);
	float sum_A,sum_B,n1=0,n2=0;
	float aver_A,aver_B;
	for(int i=1;i<=n;i++){
		if(i%k==0){
			sum_A+=i;
			n1++;
		}else{
			sum_B+=i;
			n2++;
		}
	}
	aver_A=sum_A/n1;
	aver_B=sum_B/n2;
	printf("%.1f %.1f",aver_A,aver_B);
	return 0;
}