#include<stdio.h>
int main(){
	int n,k,num=0,x=0,m=0,sum=0;
	float a1,a2;
	scanf("%d%d",&n,&k);
for(int i=1;i<=n;i++)
{
	if(i%k==0)
	{
		x++;
		num+=i;		
	}
	else m++;
	sum+=i;

}
a1=num*1.0/x;
a2=sum*1.0/m;
printf("%.1f %.1f",a1,a2);
return 0;
}