#include<stdio.h>
int main()
{
	int n,k;
	int a,b;
	double ave1=0,ave2=0;
	scanf("%d%d",&n,&k);
	while(n>1) {
		if (n%k==0) {
			ave1=ave1+n;
			a++;
		}
		else {
			ave2=ave2+n;
			b++;
		}
		n--;
	}
	printf("%.1lf %.1lf",ave1/a,ave2/b);
	return 0;
}