#include<stdio.h>
int main()
{
	int n,k,number1=0,number2=0,res1=0,res2=0;
	double Res1,Res2;
	scanf("%d %d",&n,&k);
	for(int i=1;i<=n;i++)
	{
		if(i%k==0)
		{
			res1=res1+i;
   			number1++;
		}
		else
		{
			res2=res2+i;
			number2++;
		}
	}
	Res1=res1/number1;
	Res2=res2/number2;
	printf("%.1lf %.1lf",Res1,Res2);
	return 0;
}