#include<stdio.h>
int main()
{
    int n,k,i,sum1=0,sum2=0,num1;
    double av1,av2;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
    {
        if(i%k==0)
        {
            sum1+=i;
            num1++;
        }
        else
        sum2+=i;
    }
    av1=sum1/(num1*1.0);
    av2=sum2/((n-num1)*1.0);
    printf("%.1lf %.1lf",av1,av2);
    return 0;
}