#include<bits/stdc++.h>
using namespace std;

int main(){
    int n;
    int k;
    cin >> n >> k;
    float anum = 0;
    float bnum = 0;
    float acishu = 0;
    float bcishu = 0;
    for(int i = 1;i<=n;i++)
    {
        if(i%k==0)
        {
            anum+=i;
            acishu++;
        }
        else if(i%k!=0)
        {
            bnum+=i;
            bcishu++;
        }
    }
    double a,b;
    a = anum/acishu;
    b = bnum/bcishu;
    cout << fixed << setprecision(1) << a << " " << fixed << setprecision(1) << b;
    return 0;
}