#include<stdio.h>
#include<stdlib.h>
int main()
{
    int n,k,i,sum1,sum2,a,q;
    double b,c;
    scanf("%d %d",&n,&k);
    sum1=0;sum2=0;
    a=0;q=0;
    for(i=1;i<=n;i++)
    {
        if(i%k==0)
        {
            a++;
            sum1=sum1+i;
            b=sum1/a*1.0;
        }
        else
        {
            q++;
            sum2=sum2+i;
            c=sum2/q*1.0;
        }
    }
    printf("%.1lf %.1lf",b,c);
    return 0;
}