#include <stdio.h>

int main()
{
    unsigned int n,k;
    double c=0.0,d=0.0;
    int i,j,a=0,b=0,count=0;
    
    scanf("%u %u",&n,&k);
    for(i=1;i<=n;i++){
        if(i%k==0){
            a = a+i;
            count++;
        }
        else{
            b = b+i;
        }
    }
    c = a /count;
    d = b /(n-count);
    printf("%.1lf %.1lf",c,d);
    
    return 0;
}