#include<stdio.h>

int main()

{
    
    int n,k,a,b;
    double sumA,sumB;
    scanf("%d%d",&n,&k);
    for(int i=1;i<=n;i++){
        if(i%k==0){
            sumA +=i;
            a++;
        }else {
            sumB +=i;
            b++;
        }
    }
    printf("%.1lf %.1lf",sumA/a,sumB/b);
}