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