#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	float  sum1,sum2;
	int n1,n2,k,n;
	scanf("%d %d",&n,&k);
	for(int i=1;i<=n;i++){
		if(i%k==0){
			sum1+=i;
			n1++;
		}
		else{
			sum2+=i;
			n2++;
		}
	}
	printf("%.1f ",sum1/n1);
	printf("%.1f",sum2/n2);
	return 0;
}