#include<stdio.h>
int main()
{
    int i,n,k,k1,k2,a1,a2;
    double sum1,sum2;
    scanf("%d %d",&n,&k);
    for(i=1;i<=n;i++)
    {
        if (i%k==0)
        {sum1=sum1+i;k1++;}
        else
        {sum2=sum2+i;k2++;}
    }
    a1=((int)(sum1/k1+0.5)*10)/10;
    a2=((int)(sum2/k2+0.5)*10)/10;
    printf("%.1lf %.1lf",a1,a2);
    return 0;
}