#include <stdio.h>

int main()
{
    int n,k,i,a,b,A,B;
    float aver1,aver2;
    scanf("%d%d",&n,&k);
    i=1;
    a=0;
    b=0;
    A=0,B=0;
    while(i<=n)
    {

        if(i%k==0)
        {
           a=a+i;
           A++;
        }
        else
        {
            b=b+i;
            B++;
        }
        i++;
    }

    aver1=a/A;
    aver2=b/B;
    printf("%.1f %.1f",aver1,aver2);

    return 0;
}